Fundamentals of Differential Equations (9th Edition)
9th Edition
ISBN: 9780321977069
Author: R. Kent Nagle, Edward B. Saff, Arthur David Snider
Publisher: PEARSON
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Exercises
Evaluate the following limits.
1. lim cot x/ln x
+01x
2. lim x² In x
+014
3. lim x*
x0+
4. lim (cos√√x)1/x
+014
5. lim x2/(1-cos x)
x10
6. lim e*/*
818
7. lim (secx - tan x)
x-x/2-
8. lim [1+(3/x)]*
x→∞0
In Exercises 1 through 3, let xo =
O and calculate P7(x) and R7(x).
1. f(x)=sin x, x in R.
2. f(x) = cos x, x in R.
3. f(x) = In(1+x), x≥0.
4. In Exercises 1, 2, and 3, for |x| 1, calculate a value of n such that P(x)
approximates f(x) to within 10-6.
5. Let (an)neN be a sequence of positive real numbers such that L =
lim (an+1/an) exists in R. If L < 1, show that an → 0. [Hint: Let
1111
L
iation
7. Let f be continuous on [a, b] and differentiable on (a, b). If lim f'(x)
xia
exists in R, show that f is differentiable at a and f'(a) = lim f'(x). A
similar result holds for b.
x-a
8. In reference to Corollary 5.4, give an example of a uniformly continuous
function on [0, 1] that is differentiable on (0, 1] but whose derivative is not
bounded there.
9. Recall that a fixed point of a function f is a point c such that f(c) = c.
(a) Show that if f is differentiable on R and f'(x)| x if x 1 and hence In(1+x) 0.
12. For 0 л/2. (Thus,
as x л/2 from the left, cos x is never large enough for x+cosx to be
greater than л/2 and cot x is never small enough for x + cot x to be less
than x/2.)
Chapter 1 Solutions
Fundamentals of Differential Equations (9th Edition)
Ch. 1.1 - In Problems 112, a differential equation is given...Ch. 1.1 - In Problems 112, a differential equation is given...Ch. 1.1 - In Problems 112, a differential equation is given...Ch. 1.1 - In Problems 112, a differential equation is given...Ch. 1.1 - In Problems 112, a differential equation is given...Ch. 1.1 - In Problems 112, a differential equation is given...Ch. 1.1 - In Problems 112, a differential equation is given...Ch. 1.1 - In Problems 112, a differential equation is given...Ch. 1.1 - Prob. 9ECh. 1.1 - In Problems 112, a differential equation is given...
Ch. 1.1 - In Problems 112, a differential equation is given...Ch. 1.1 - Prob. 12ECh. 1.1 - In Problems 1316, write a differential equation...Ch. 1.1 - In Problems 1316, write a differential equation...Ch. 1.1 - In Problems 1316, write a differential equation...Ch. 1.1 - In Problems 1316, write a differential equation...Ch. 1.1 - Prob. 17ECh. 1.2 - (a) Show that (x) = x2 is an explicit solution to...Ch. 1.2 - (a) Show that y2 + x 3 = 0 is an implicit...Ch. 1.2 - In Problems 38, determine whether the given...Ch. 1.2 - In Problems 38, determine whether the given...Ch. 1.2 - In Problems 38, determine whether the given...Ch. 1.2 - In Problems 38, determine whether the given...Ch. 1.2 - In Problems 38, determine whether the given...Ch. 1.2 - In Problems 38, determine whether the given...Ch. 1.2 - In Problems 913, determine whether the given...Ch. 1.2 - In Problems 913, determine whether the given...Ch. 1.2 - In Problems 913, determine whether the given...Ch. 1.2 - In Problems 913, determine whether the given...Ch. 1.2 - In Problems 913, determine whether the given...Ch. 1.2 - Prob. 14ECh. 1.2 - Verify that (x) = 2/(1 cex), where c is an...Ch. 1.2 - Verify that x2 + cy2 = 1, where c is an arbitrary...Ch. 1.2 - Show that (x) = Ce3x + 1 is a solution to dy/dx ...Ch. 1.2 - Let c 0. Show that the function (x) = (c2 x2) 1...Ch. 1.2 - Prob. 19ECh. 1.2 - Determine for which values of m the function (x) =...Ch. 1.2 - Prob. 21ECh. 1.2 - Prob. 22ECh. 1.2 - Prob. 23ECh. 1.2 - In Problem 2328, determine whether Theorem 1...Ch. 1.2 - In Problem 2328, determine whether Theorem 1...Ch. 1.2 - (a) Find the total area between f(x) = x3 x and...Ch. 1.2 - In Problem 2328, determine whether Theorem 1...Ch. 1.2 - In Problem 2328, determine whether Theorem 1...Ch. 1.2 - (a) For the initial value problem (12) of Example...Ch. 1.2 - Prob. 30ECh. 1.2 - Consider the equation of Example 5, (13)ydydx4x=0....Ch. 1.3 - The direction field for dy/dx = 4x/y is shown in...Ch. 1.3 - Prob. 2ECh. 1.3 - A model for the velocity at time t of a certain...Ch. 1.3 - Prob. 4ECh. 1.3 - The logistic equation for the population (in...Ch. 1.3 - Consider the differential equation dydx=x+siny....Ch. 1.3 - Consider the differential equation dpdt=p(p1)(2p)...Ch. 1.3 - The motion of a set of particles moving along the...Ch. 1.3 - Let (x) denote the solution to the initial value...Ch. 1.3 - Use a computer software package to sketch the...Ch. 1.3 - Prob. 11ECh. 1.3 - Prob. 12ECh. 1.3 - Prob. 13ECh. 1.3 - In Problems 11-16, draw the isoclines with their...Ch. 1.3 - Prob. 15ECh. 1.3 - Prob. 16ECh. 1.3 - From a sketch of the direction field, what can one...Ch. 1.3 - Prob. 18ECh. 1.3 - Prob. 19ECh. 1.3 - Prob. 20ECh. 1.4 - In many of the problems below, it will be helpful...Ch. 1.4 - Prob. 2ECh. 1.4 - Prob. 3ECh. 1.4 - Prob. 4ECh. 1.4 - Prob. 5ECh. 1.4 - Use Eulers method with step size h = 0.2 to...Ch. 1.4 - Prob. 7ECh. 1.4 - Prob. 8ECh. 1.4 - Prob. 9ECh. 1.4 - Use the strategy of Example 3 to find a value of h...Ch. 1.4 - Prob. 11ECh. 1.4 - Prob. 12ECh. 1.4 - Prob. 13ECh. 1.4 - Prob. 14ECh. 1.4 - Prob. 15ECh. 1.4 - Prob. 16ECh. 1 - In Problems 16, identify the independent variable,...Ch. 1 - Prob. 2RPCh. 1 - Prob. 3RPCh. 1 - Prob. 4RPCh. 1 - Prob. 5RPCh. 1 - Prob. 6RPCh. 1 - Prob. 7RPCh. 1 - Prob. 8RPCh. 1 - Prob. 9RPCh. 1 - Prob. 10RPCh. 1 - Prob. 11RPCh. 1 - Prob. 12RPCh. 1 - Prob. 13RPCh. 1 - Prob. 14RPCh. 1 - Prob. 15RPCh. 1 - Prob. 16RPCh. 1 - Prob. 17RPCh. 1 - Prob. 1TWECh. 1 - Compare the different types of solutions discussed...
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