Mathematical Methods in the Physical Sciences
Mathematical Methods in the Physical Sciences
3rd Edition
ISBN: 9780471198260
Author: Mary L. Boas
Publisher: Wiley, John & Sons, Incorporated
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Chapter 8.9, Problem 22P

By using Laplace transforms, solve the following differential equations subject to the given initial conditions.

y ″ + 2 y ′ + 5 y = 10 cos t , y 0 = 2 , y 0 ′ = 1

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Chapter 8 Solutions

Mathematical Methods in the Physical Sciences

Ch. 8.1 - Verify the statement of Example 2. Also verify...Ch. 8.1 - Solve Example 4 using the general solution...Ch. 8.1 - Verify that y=sinx,y=cosx,y=eix, and y=eix are all...Ch. 8.1 - Find the distance which an object moves in time t...Ch. 8.1 - Find the position x of a particle at time t if its...Ch. 8.1 - A substance evaporates at a rate proportional to...Ch. 8.1 - The momentum p of an electron at speed v near the...Ch. 8.2 - For each of the following differential equations,...Ch. 8.2 - For each of the following differential equations,...Ch. 8.2 - For each of the following differential equations,...
Ch. 8.2 - For each of the following differential equations,...Ch. 8.2 - For each of the following differential equations,...Ch. 8.2 - For each of the following differential equations,...Ch. 8.2 - For each of the following differential equations,...Ch. 8.2 - For each of the following differential equations,...Ch. 8.2 - For each of the following differential equations,...Ch. 8.2 - For each of the following differential equations,...Ch. 8.2 - For each of the following differential equations,...Ch. 8.2 - For each of the following differential equations,...Ch. 8.2 - In Problems 13 to 15, find a solution (or...Ch. 8.2 - In Problems 13 to 15, find a solution (or...Ch. 8.2 - In Problems 13 to 15, find a solution (or...Ch. 8.2 - By separation of variables, find a solution of the...Ch. 8.2 - The speed of a particle on the x axis, x0, is...Ch. 8.2 - Let the rate of growth dN/dt of a colony of...Ch. 8.2 - (a) Consider a light beam traveling downward into...Ch. 8.2 - Consider the following special cases of the simple...Ch. 8.2 - Suppose the rate at which bacteria in a culture...Ch. 8.2 - Solve the equation for the rate of growth of...Ch. 8.2 - Heat is escaping at a constant rate [dQ/dtin(1.1)...Ch. 8.2 - Do Problem 23 for a spherical cavity containing a...Ch. 8.2 - Show that the thickness of the ice on a lake...Ch. 8.2 - An object of mass m falls from rest under gravity...Ch. 8.2 - According to Newtons law of cooling, the rate at...Ch. 8.2 - A glass of milk at 38 is removed from the...Ch. 8.2 - A solution containing 90 by volume of alcohol (in...Ch. 8.2 - If P dollars are left in the bank at interest I...Ch. 8.2 - Find the orthogonal trajectories of each of the...Ch. 8.2 - Find the orthogonal trajectories of each of the...Ch. 8.2 - Find the orthogonal trajectories of each of the...Ch. 8.2 - Find the orthogonal trajectories of each of the...Ch. 8.2 - Find the orthogonal trajectories of each of the...Ch. 8.3 - Using (3.9), find the general solution of each of...Ch. 8.3 - Using (3.9), find the general solution of each of...Ch. 8.3 - Using (3.9), find the general solution of each of...Ch. 8.3 - Using (3.9), find the general solution of each of...Ch. 8.3 - Using (3.9), find the general solution of each of...Ch. 8.3 - Using (3.9), find the general solution of each of...Ch. 8.3 - Using (3.9), find the general solution of each of...Ch. 8.3 - Using (3.9), find the general solution of each of...Ch. 8.3 - Using (3.9), find the general solution of each of...Ch. 8.3 - Using (3.9), find the general solution of each of...Ch. 8.3 - Using (3.9), find the general solution of each of...Ch. 8.3 - Using (3.9), find the general solution of each of...Ch. 8.3 - Using (3.9), find the general solution of each of...Ch. 8.3 - Using (3.9), find the general solution of each of...Ch. 8.3 - Water with a small salt content (5 lb in 1000 gal)...Ch. 8.3 - Find the general solution of (1.2) for an RL...Ch. 8.3 - Find the general solution of (1.3) for an RC...Ch. 8.3 - Prob. 18PCh. 8.3 - If 1=2= in (3.10), then e21tdt=dt. Find N2 for...Ch. 8.3 - Extend the radioactive decay problem (Example 2)...Ch. 8.3 - Generalize Problem 20 to any number of stages.Ch. 8.3 - Find the orthogonal trajectories of the family of...Ch. 8.3 - Find the orthogonal trajectories of the family of...Ch. 8.4 - Use the methods of this section to solve the...Ch. 8.4 - Use the methods of this section to solve the...Ch. 8.4 - Use the methods of this section to solve the...Ch. 8.4 - Use the methods of this section to solve the...Ch. 8.4 - Use the methods of this section to solve the...Ch. 8.4 - Use the methods of this section to solve the...Ch. 8.4 - Use the methods of this section to solve the...Ch. 8.4 - Use the methods of this section to solve the...Ch. 8.4 - Use the methods of this section to solve the...Ch. 8.4 - Use the methods of this section to solve the...Ch. 8.4 - Use the methods of this section to solve the...Ch. 8.4 - Use the methods of this section to solve the...Ch. 8.4 - Use the methods of this section to solve the...Ch. 8.4 - Use the methods of this section to solve the...Ch. 8.4 - Use the methods of this section to solve the...Ch. 8.4 - Solve the differential equation yy2+2xyy=0 by...Ch. 8.4 - If an incompressible fluid flows in a corner...Ch. 8.4 - Find the family of orthogonal trajectories of the...Ch. 8.4 - Find the family of curves satisfying the...Ch. 8.4 - Find the shape of a mirror which has the property...Ch. 8.4 - As in text just before (4.11), show that (a)...Ch. 8.4 - Show that the change of variables (4.13) in (4.11)...Ch. 8.4 - Show that (xP+yQ)1 is an integrating factor for...Ch. 8.4 - Solve Problems 9 and 10 by using an integrating...Ch. 8.4 - An equation of the form y=f(x)y2+g(x)y+h(x) is...Ch. 8.4 - Show that the substitution given in Problem 25...Ch. 8.5 - Solve the following differential equations by the...Ch. 8.5 - Solve the following differential equations by the...Ch. 8.5 - Solve the following differential equations by the...Ch. 8.5 - Solve the following differential equations by the...Ch. 8.5 - Solve the following differential equations by the...Ch. 8.5 - Solve the following differential equations by the...Ch. 8.5 - Solve the following differential equations by the...Ch. 8.5 - Solve the following differential equations by the...Ch. 8.5 - Solve the following differential equations by the...Ch. 8.5 - Solve the following differential equations by the...Ch. 8.5 - Solve the following differential equations by the...Ch. 8.5 - Solve the following differential equations by the...Ch. 8.5 - Recall from Chapter 3, equation ( 8.5), that a set...Ch. 8.5 - Recall from Chapter 3, equation ( 8.5), that a set...Ch. 8.5 - Recall from Chapter 3, equation ( 8.5), that a set...Ch. 8.5 - Recall from Chapter 3, equation (8.5), that a set...Ch. 8.5 - Recall from Chapter 3, equation ( 8.5), that a set...Ch. 8.5 - Recall from Chapter 3, equation (8.5), that a set...Ch. 8.5 - Solve the algebraic equation D2+(1+2i)D+i1=0 (note...Ch. 8.5 - As in Problem 19, solve y+(1i)yiy=0. Hint: See...Ch. 8.5 - By the method used in solving (5.4) to get (5.9),...Ch. 8.5 - Use the results of Problem 21 to find the general...Ch. 8.5 - Use the results of Problem 21 to find the general...Ch. 8.5 - Use the results of Problem 21 to find the general...Ch. 8.5 - Use the results of Problem 21 to find the general...Ch. 8.5 - Use the results of Problem 21 to find the general...Ch. 8.5 - Use the results of Problem 21 to find the general...Ch. 8.5 - Use the results of Problem 21 to find the general...Ch. 8.5 - Use the results of Problem 21 to find the general...Ch. 8.5 - Use the results of Problem 21 to find the general...Ch. 8.5 - Let D stand for d/dx, that is, Dy=dy/dx; then...Ch. 8.5 - In Example 3, we used the second solution in...Ch. 8.5 - A particle moves along the x axis subject to a...Ch. 8.5 - Find the equation of motion of a simple pendulum...Ch. 8.5 - The gravitational force on a particle of mass m...Ch. 8.5 - Find (in terms of L and C) the frequency of...Ch. 8.5 - A block of wood is floating in water; it is...Ch. 8.5 - Solve the RLC circuit equation [(5.33)or(5.34)]...Ch. 8.5 - (a) Find numerical values of the constants and...Ch. 8.5 - The natural period of an undamped system is 3 sec,...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Find the general solution of the following...Ch. 8.6 - Verify that (6.4) is a particular solution of...Ch. 8.6 - Solve (6.16) by the method used in solving (...Ch. 8.6 - Consider the differential equation...Ch. 8.6 - (a) Show that (Da)ecx=(ca)ecx;...Ch. 8.6 - (a) Show that Deaxy=eax(D+a)y, D2eaxy=eax(D+a)2y,...Ch. 8.6 - Using Problems 29 and 31b, show that equation...Ch. 8.6 - In Problem 33 to 38, solve the given differential...Ch. 8.6 - In Problem 33 to 38, solve the given differential...Ch. 8.6 - In Problem 33 to 38, solve the given differential...Ch. 8.6 - In Problem 33 to 38, solve the given differential...Ch. 8.6 - In Problem 33 to 38, solve the given differential...Ch. 8.6 - In Problem 33 to 38, solve the given differential...Ch. 8.6 - Find the solutions of (1.2) (put I=dq/dt ) and...Ch. 8.6 - In (6.38), show that for a given forcing frequency...Ch. 8.6 - Solve Problems 41 and 42 by use of Fourier series....Ch. 8.6 - Solve Problems 41 and 42 by use of Fourier series....Ch. 8.6 - Consider an equation for damped forced vibrations...Ch. 8.7 - Solve the following differential equations by...Ch. 8.7 - Solve the following differential equations by...Ch. 8.7 - Solve the following differential equations by...Ch. 8.7 - Solve the following differential equations by...Ch. 8.7 - The differential equation of a hanging chain...Ch. 8.7 - The curvature of a curve in the (x,y) plane is...Ch. 8.7 - Solve y+2y=0 by method (c) above and compare with...Ch. 8.7 - The force of gravitational attraction on a mass m...Ch. 8.7 - Show that (7.15) is a separable equation. [You may...Ch. 8.7 - In Problems 10 and 11, solve (7.14) to find v(x)...Ch. 8.7 - In Problems 10 and 11, solve (7.14) to find v(x)...Ch. 8.7 - In Problem 11, find v(x) if v=0,x=1, at t=0. Then...Ch. 8.7 - The exact equation of motion of a simple pendulum...Ch. 8.7 - Verify (7.19) and (7.20). Hint:...Ch. 8.7 - If you solve (7.17) when f(x)=0 by assuming a...Ch. 8.7 - Solve the following equations either by method (d)...Ch. 8.7 - Solve the following equations using method (d)...Ch. 8.7 - Solve the following equations using method (d)...Ch. 8.7 - Solve the following equations using method (d)...Ch. 8.7 - Solve the following equations using method (d)...Ch. 8.7 - Solve the following equations using method (d)...Ch. 8.7 - Solve the following equations using method (d)...Ch. 8.7 - Solve the two differential equations in Problem...Ch. 8.7 - Substitute (7.22) into (7.21) to obtain the...Ch. 8.7 - For the following problems, verify the given...Ch. 8.7 - For the following problems, verify the given...Ch. 8.7 - For the following problems, verify the given...Ch. 8.7 - For the following problems, verify the given...Ch. 8.7 - For the following problems, verify the given...Ch. 8.7 - For the following problems, verify the given...Ch. 8.8 - For integral k, verify L5 and L6 in the Laplace...Ch. 8.8 - By using L2, verify L7 and L8 in the Laplace...Ch. 8.8 - Using either L2, or L3 and L4, verify L9 and L10.Ch. 8.8 - By differentiating the appropriate formula with...Ch. 8.8 - By integrating the appropriate formula with...Ch. 8.8 - By replacing a in L2 by a+ib and then by aib, and...Ch. 8.8 - Verify L15 to L18, by combining appropriate...Ch. 8.8 - Find the inverse transforms of the functions F(p)...Ch. 8.8 - Find the inverse transforms of the functions F(p)...Ch. 8.8 - Find the inverse transforms of the functions F(p)...Ch. 8.8 - Find the inverse transforms of the functions F(p)...Ch. 8.8 - Find the inverse transforms of the functions F(p)...Ch. 8.8 - Find the inverse transforms of the functions F(p)...Ch. 8.8 - Show that a combination of entries L3 to L10, L13,...Ch. 8.8 - Prove L32 for n=1. Hint: Differentiate equation...Ch. 8.8 - Use L32 and L3 to obtain L11.Ch. 8.8 - Use L32 and L11 to obtain Lt2sinat.Ch. 8.8 - Use L31 to derive L21Ch. 8.8 - Table entries L28 and L29 are known as translation...Ch. 8.8 - Table entries L28 and L29 are known as translation...Ch. 8.8 - Table entries L28 and L29 are known as translation...Ch. 8.8 - Table entries L28 and L29 are known as translation...Ch. 8.8 - Table entries L28 and L29 are known as translation...Ch. 8.8 - Table entries L28 and L29 are known as translation...Ch. 8.8 - Table entries L28 and L29 are known as translation...Ch. 8.8 - Table entries L28 and L29 are known as translation...Ch. 8.8 - Table entries L28 and L29 are known as translation...Ch. 8.9 - Continuing the method used in deriving (9.1) and...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - By using Laplace transforms, solve the following...Ch. 8.9 - Solve the following sets of equations by the...Ch. 8.9 - Solve the following sets of equations by the...Ch. 8.9 - Solve the following sets of equations by the...Ch. 8.9 - Solve the following sets of equations by the...Ch. 8.9 - Solve the following sets of equations by the...Ch. 8.9 - Solve the following sets of equations by the...Ch. 8.9 - Solve the following sets of equations by the...Ch. 8.9 - Evaluate each of the following definite integrals...Ch. 8.9 - Evaluate each of the following definite integrals...Ch. 8.9 - Evaluate each of the following definite integrals...Ch. 8.9 - Evaluate each of the following definite integrals...Ch. 8.9 - Evaluate each of the following definite integrals...Ch. 8.9 - Evaluate each of the following definite integrals...Ch. 8.9 - Evaluate each of the following definite integrals...Ch. 8.9 - Evaluate each of the following definite integrals...Ch. 8.9 - Evaluate each of the following definite integrals...Ch. 8.10 - Show that g*h=h*g as claimed in I34. Hint: Let u=t...Ch. 8.10 - Use L34 and L2 to find the inverse transform of...Ch. 8.10 - Use the convolution integral to find the inverse...Ch. 8.10 - Use the convolution integral to find the inverse...Ch. 8.10 - Use the convolution integral to find the inverse...Ch. 8.10 - Use the convolution integral to find the inverse...Ch. 8.10 - Use the convolution integral to find the inverse...Ch. 8.10 - Use the convolution integral to find the inverse...Ch. 8.10 - Use the convolution integral to find the inverse...Ch. 8.10 - Use the convolution integral to find the inverse...Ch. 8.10 - Use the convolution integral to find the inverse...Ch. 8.10 - Use the convolution integral to find the inverse...Ch. 8.10 - Use the Laplace transform table to find...Ch. 8.10 - Use the convolution integral (see Example 2) to...Ch. 8.10 - Use the convolution integral (see Example 2) to...Ch. 8.10 - Consider solving an equation like (10.1) but with...Ch. 8.10 - Solve the differential equation ya2y=f(t), where...Ch. 8.10 - A mechanical or electrical system is described by...Ch. 8.10 - Following the method of equations (10.8) to...Ch. 8.11 - Find the inverse Laplace transform of e2p/p2 in...Ch. 8.11 - Verify L24 in the table by using L1, L27, and the...Ch. 8.11 - Verify L28 in the table by using L27 and the...Ch. 8.11 - Show that fn(t)dt=1 for the functions fn(t) in...Ch. 8.11 - Solve the differential equation y+2y=f(t),y0=y0=0,...Ch. 8.11 - (a) Let a mechanical or electrical system be...Ch. 8.11 - Using the function method, find the response (see...Ch. 8.11 - Using the function method, find the response (see...Ch. 8.11 - Using the function method, find the response (see...Ch. 8.11 - Using the function method, find the response (see...Ch. 8.11 - Using the function method, find the response (see...Ch. 8.11 - Evaluate the functions fn(xa) defined by the...Ch. 8.11 - Using functions, write the following mass or...Ch. 8.11 - Integrate by parts as we did for (11.14) to obtain...Ch. 8.11 - Use (11.6) and (11.14) to (11.16) to evaluate the...Ch. 8.11 - Verify the operator equation ddxsgnx=2(x) where...Ch. 8.11 - Verify (11.18a) and (11.18c) by multiplying by a...Ch. 8.11 - Use equation (11.16) to generalize the operator...Ch. 8.11 - (a) Show that you can differentiate a generalized...Ch. 8.11 - Verify the operator equations in (11.19) not done...Ch. 8.11 - Make use of the operator equations (11.19) and...Ch. 8.11 - You may find the spherical coordinate function...Ch. 8.11 - Write a formula in rectangular coordinates, in...Ch. 8.11 - Prob. 24PCh. 8.11 - Let F(x)=x2,x0,0,x0. Show that F(x)=0 for all x0,...Ch. 8.12 - Solve (12.3) if G=0 and dG/dt=0 at t=0 to obtain...Ch. 8.12 - In Problems 2 and 3, use (12.6) to solve (12.1)...Ch. 8.12 - In Problems 2 and 3, use (12.6) to solve (12.1)...Ch. 8.12 - Use equation (12.6) to solve Problem 10.18.Ch. 8.12 - Obtain ( 12.6 ) by using the convolution integral...Ch. 8.12 - For Problem 10.17, show (as in Problem 1) that the...Ch. 8.12 - Use the Green function of Problem 6 to solve...Ch. 8.12 - Solve the differential equation...Ch. 8.12 - Following the proof of (12.4), show that (12.9)...Ch. 8.12 - Solve (12.12) and (12.14) to get (12.15). Hint:...Ch. 8.12 - In Problems 11 to 13, use (12.17) to find the...Ch. 8.12 - In Problems 11 to 13, use (12.17) to find the...Ch. 8.12 - In Problems 11 to 13, use (12.17) to find the...Ch. 8.12 - (a) Given that y1(x) and y2(x) are solutions of...Ch. 8.12 - In Problems 15 to 18, use the given solutions of...Ch. 8.12 - In Problems 15 to 18, use the given solutions of...Ch. 8.12 - In Problems 15 to 18, use the given solutions of...Ch. 8.12 - In Problems 15 to 18, use the given solutions of...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - Identify each of the differential equations in...Ch. 8.13 - In Problems 25 to 28, find a particular solution...Ch. 8.13 - In Problems 25 to 28, find a particular solution...Ch. 8.13 - In Problems 25 to 28, find a particular solution...Ch. 8.13 - In Problems 25 to 28, find a particular solution...Ch. 8.13 - If 10kg of rock salt is placed in water, it...Ch. 8.13 - A mass m falls under gravity (force mg ) through a...Ch. 8.13 - The acceleration of an electron in the electric...Ch. 8.13 - Suppose that the rate at which you work on a hot...Ch. 8.13 - Compare the temperatures of your cup of coffee at...Ch. 8.13 - A flexible chain of length l is hung over a peg...Ch. 8.13 - A raindrop falls through a cloud, increasing in...Ch. 8.13 - (a) A rocket of (variable) mass m is propelled by...Ch. 8.13 - The differential equation for the path of a planet...Ch. 8.13 - Use L15 and L31 to find the Laplace transform of...Ch. 8.13 - Use L32 and L9 to find the Laplace transform of t...Ch. 8.13 - Use the Laplace transform table to evaluate:...Ch. 8.13 - Use the Laplace transform table to evaluate:...Ch. 8.13 - Find the inverse Laplace transform of: p(p+a)3Ch. 8.13 - Find the inverse Laplace transform of: p2p2+a22Ch. 8.13 - Find the inverse Laplace transform of: 1p2+a23Ch. 8.13 - Prove the following shifting or translation...Ch. 8.13 - Use the table of Laplace transforms to find the...Ch. 8.13 - Solve Problems 47 and 48 either by Laplace...Ch. 8.13 - Solve Problems 47 and 48 either by Laplace...

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Intro to the Laplace Transform & Three Examples; Author: Dr. Trefor Bazett;https://www.youtube.com/watch?v=KqokoYr_h1A;License: Standard YouTube License, CC-BY