
Mathematical Methods in the Physical Sciences
3rd Edition
ISBN: 9780471198260
Author: Mary L. Boas
Publisher: Wiley, John & Sons, Incorporated
expand_more
expand_more
format_list_bulleted
Textbook Question
Chapter 1.5, Problem 11P
Using (4.6), give a proof of the preliminary test. Hint: Sn — Sn-1 = an.
Expert Solution & Answer

Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
https://www.hawkeslearning.com/Statistics/dbs2/datasets.html
Determine whether each function is an injection and determine whether each is a surjection.The notation Z_(n) refers to the set {0,1,2,...,n-1}. For example, Z_(4)={0,1,2,3}. f: Z_(6) -> Z_(6) defined by f(x)=x^(2)+4(mod6). g: Z_(5) -> Z_(5) defined by g(x)=x^(2)-11(mod5). h: Z*Z -> Z defined by h(x,y)=x+2y. j: R-{3} -> R defined by j(x)=(4x)/(x-3).
Determine whether each function is an injection and determine whether each is a surjection.
Chapter 1 Solutions
Mathematical Methods in the Physical Sciences
Ch. 1.1 - In the bouncing ball example above, find the...Ch. 1.1 - Derive the formula (1.4) for the sum Sn of the...Ch. 1.1 - Use equation (1.8) to find the fractions that are...Ch. 1.1 - Use equation (1.8) to find the fractions that are...Ch. 1.1 - Use equation (1.8) to find the fractions that are...Ch. 1.1 - Use equation (1.8) to find the fractions that are...Ch. 1.1 - Use equation (1.8) to find the fractions that are...Ch. 1.1 - Use equation (1.8) to find the fractions that are...Ch. 1.1 - Use equation (1.8) to find the fractions that are...Ch. 1.1 - Use equation (1.8) to find the fractions that are...
Ch. 1.1 - Use equation (1.8) to find the fractions that are...Ch. 1.1 - In a water purification process, one-nth of the...Ch. 1.1 - If you invest a dollar at 6% interest compounded...Ch. 1.1 - A computer program gives the result 1/6 for the...Ch. 1.1 - Connect the midpoints of the sides of an...Ch. 1.1 - Suppose a large number of particles are bouncing...Ch. 1.2 - In the following problems, find the limit of the...Ch. 1.2 - In the following problems, find the limit of the...Ch. 1.2 - In the following problems, find the limit of the...Ch. 1.2 - In the following problems, find the limit of the...Ch. 1.2 - In the following problems, find the limit of the...Ch. 1.2 - In the following problems, find the limit of the...Ch. 1.2 - In the following problems, find the limit of the...Ch. 1.2 - In the following problems, find the limit of the...Ch. 1.2 - In the following problems, find the limit of the...Ch. 1.4 - For the following series, write formulas for the...Ch. 1.4 - For the following, write formulas for the...Ch. 1.4 - For the following series, write formulas for the...Ch. 1.4 - For the following series, write formulas for the...Ch. 1.4 - For the following series, write formulas for the...Ch. 1.4 - For the following series, write formulas for the...Ch. 1.4 - For the following series, write formulas for the...Ch. 1.5 - Use the preliminary test to decide whether the...Ch. 1.5 - Use the preliminary test to decide whether the...Ch. 1.5 - Use the preliminary test to decide whether the...Ch. 1.5 - Use the preliminary test to decide whether the...Ch. 1.5 - Use the preliminary test to decide whether the...Ch. 1.5 - Use the preliminary test to decide whether the...Ch. 1.5 - Use the preliminary test to decide whether the...Ch. 1.5 - Use the preliminary test to decide whether the...Ch. 1.5 - Use the preliminary test to decide whether the...Ch. 1.5 - Use the preliminary test to decide whether the...Ch. 1.5 - Using (4.6), give a proof of the preliminary test....Ch. 1.6 - Show that n! 2 for all n 3. Hint: Write out a...Ch. 1.6 - Prove that the harmonic series n=11/n is divergent...Ch. 1.6 - Prove the convergence n=11/n2 by grouping terms...Ch. 1.6 - Use the comparison test to prove the convergence...Ch. 1.6 - Test the following series for convergence using...Ch. 1.6 - There are 9 one-digit numbers (1 to 9), 90...Ch. 1.6 - Use the integral test to find whether the...Ch. 1.6 - Use the integral test to find whether the...Ch. 1.6 - Use the integral test to find whether the...Ch. 1.6 - Use the integral test to find whether the...Ch. 1.6 - Use the integral test to find whether the...Ch. 1.6 - Use the integral test to find whether the...Ch. 1.6 - Use the integral test to find whether the...Ch. 1.6 - Use the integral test to find whether the...Ch. 1.6 - Use the integral test to prove the following...Ch. 1.6 - In testing 1/n2 for convergence, a student...Ch. 1.6 - Use the integral test to show that n=0en2...Ch. 1.6 - Use the ratio test to find whether the following...Ch. 1.6 - Use the ratio test to find whether the following...Ch. 1.6 - Use the ratio test to find whether the following...Ch. 1.6 - Use the ratio test to find whether the following...Ch. 1.6 - Use the ratio test to find whether the following...Ch. 1.6 - Use the ratio test to find whether the following...Ch. 1.6 - Use the ratio test to find whether the following...Ch. 1.6 - Use the ratio test to find whether the following...Ch. 1.6 - Use the ratio test to find whether the following...Ch. 1.6 - Use the ratio test to find whether the following...Ch. 1.6 - Use the ratio test to find whether the following...Ch. 1.6 - Use the ratio test to find whether the following...Ch. 1.6 - Prove the ratio test. Hint: If an+1/an1, take ...Ch. 1.6 - Use the special comparison test to find whether...Ch. 1.6 - Use the special comparison test to find whether...Ch. 1.6 - Use the special comparison test to find whether...Ch. 1.6 - Use the special comparison test to find whether...Ch. 1.6 - Use the special comparison test to find whether...Ch. 1.6 - Use the special comparison test to find whether...Ch. 1.6 - Prove the special comparison test. Hint (part a):...Ch. 1.7 - Test the following series for convergence....Ch. 1.7 - Test the following series for convergence....Ch. 1.7 - Test the following series for convergence....Ch. 1.7 - Test the following series for convergence....Ch. 1.7 - Test the following series for convergence....Ch. 1.7 - Test the following series for convergence....Ch. 1.7 - Test the following series for convergence....Ch. 1.7 - Test the following series for convergence....Ch. 1.7 - Prove that an absolutely convergent series n=1an...Ch. 1.7 - The following alternating series are divergent...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.9 - Test the following series for convergence or...Ch. 1.10 - Find the interval of convergence of each of the...Ch. 1.10 - Find the interval of convergence of each of the...Ch. 1.10 - Find the interval of convergence of each of the...Ch. 1.10 - Find the interval of convergence of each of the...Ch. 1.10 - Find the interval of convergence of each of the...Ch. 1.10 - Find the interval of convergence of each of the...Ch. 1.10 - Find the interval of convergence of each of the...Ch. 1.10 - Find the interval of convergence of each of the...Ch. 1.10 - Find the interval of convergence of each of the...Ch. 1.10 - Find the interval of convergence of each of the...Ch. 1.10 - Find the interval of convergence of each of the...Ch. 1.10 - Find the interval of convergence of each of the...Ch. 1.10 - Find the interval of convergence of each of the...Ch. 1.10 - Find the interval of convergence of each of the...Ch. 1.10 - Find the interval of convergence of each of the...Ch. 1.10 - Find the interval of convergence of each of the...Ch. 1.10 - Find the interval of convergence of each of the...Ch. 1.10 - Find the interval of convergence of each of the...Ch. 1.10 - The following series are not power series, but you...Ch. 1.10 - The following series are not power series, but you...Ch. 1.10 - The following series are not power series, but you...Ch. 1.10 - The following series are not power series, but you...Ch. 1.10 - The following series are not power series, but you...Ch. 1.10 - The following series are not power series, but you...Ch. 1.10 - The following series are not power series, but you...Ch. 1.12 - By the method used to obtain (12.5) [which is the...Ch. 1.13 - Use the ratio test to show that a binomial series...Ch. 1.13 - Show that the binomial coefficients 1n=(1)n.Ch. 1.13 - Show that if p is a positive integer, then pn=0...Ch. 1.13 - Write the Maclaurin series for 1/1+x in form...Ch. 1.13 - Using the methods of this section: Find the first...Ch. 1.13 - Using the methods of this section: Find the first...Ch. 1.13 - Using the methods of this section: Find the first...Ch. 1.13 - Using the methods of this section: Find the first...Ch. 1.13 - Using the methods of this section: Find the first...Ch. 1.13 - Using the methods of this section: Find the first...Ch. 1.13 - Using the methods of this section: Find the first...Ch. 1.13 - Using the methods of this section: Find the first...Ch. 1.13 - Using the methods of this section: Find the first...Ch. 1.13 - Using the methods of this section: Find the first...Ch. 1.13 - Using the methods of this section: Find the first...Ch. 1.13 - Using the methods of this section: Find the first...Ch. 1.13 - Using the methods of this section: Find the first...Ch. 1.13 - Using the methods of this section: Find the first...Ch. 1.13 - Using the methods of this section: Find the first...Ch. 1.13 - Find the first few terms of the Maclaurin series...Ch. 1.13 - Find the first few terms of the Maclaurin series...Ch. 1.13 - Find the first few terms of the Maclaurin series...Ch. 1.13 - Find the first few terms of the Maclaurin series...Ch. 1.13 - Find the first few terms of the Maclaurin series...Ch. 1.13 - Find the first few terms of the Maclaurin series...Ch. 1.13 - Find the first few terms of the Maclaurin series...Ch. 1.13 - Find the first few terms of the Maclaurin series...Ch. 1.13 - Find the first few terms of the Maclaurin series...Ch. 1.13 - Find the first few terms of the Maclaurin series...Ch. 1.13 - Find the first few terms of the Maclaurin series...Ch. 1.13 - Find the first few terms of the Maclaurin series...Ch. 1.13 - Find the first few terms of the Maclaurin series...Ch. 1.13 - Find the first few terms of the Maclaurin series...Ch. 1.13 - Find the first few terms of the Maclaurin series...Ch. 1.13 - Find the first few terms of the Maclaurin series...Ch. 1.13 - Find the first few terms of the Maclaurin series...Ch. 1.13 - In cos x Hints: Method l: Write cos x = 1+(cos...Ch. 1.13 - Find the first few terms of the Maclaurin series...Ch. 1.13 - Using method F above, find the first few terms of...Ch. 1.13 - Using method F above, find the first few terms of...Ch. 1.13 - Using method F above, find the first few terms of...Ch. 1.13 - Using method F above, find the first few terms of...Ch. 1.13 - Using method F above, find the first few terms of...Ch. 1.13 - Using method F above, find the first few terms of...Ch. 1.14 - Prove theorem (14.3). Hint: Group the terms in the...Ch. 1.14 - Using computer or tables (or Chapter 7, Section...Ch. 1.14 - In Problem 3 to 7, assume that the Maclaurin...Ch. 1.14 - In Problem 3 to 7, assume that the Maclaurin...Ch. 1.14 - In Problem 3 to 7, assume that the Maclaurin...Ch. 1.14 - In Problem 3 to 7, assume that the Maclaurin...Ch. 1.14 - In Problem 3 to 7, assume that the Maclaurin...Ch. 1.14 - Estimate the error if n=1xn/n3 is approximated by...Ch. 1.14 - Consider the series in Problem 4.6 and show that...Ch. 1.14 - Show that the interval of convergence of the...Ch. 1.14 - Show that the Maclaurin series for sin x converges...Ch. 1.14 - Show as in Problem 11 that the Maclaurin series...Ch. 1.14 - Show that Maclaurin for (1+x)p converges to (1+x)p...Ch. 1.15 - In problems 1 to 4, use power series to evaluate...Ch. 1.15 - In problems 1 to 4, use power series to evaluate...Ch. 1.15 - In problems 1 to 4, use power series to evaluate...Ch. 1.15 - In problems 1 to 4, use power series to evaluate...Ch. 1.15 - Use Maclaurin series to evaluate each of the...Ch. 1.15 - Use Maclaurin series to evaluate each of the...Ch. 1.15 - Use Maclaurin series to evaluate each of the...Ch. 1.15 - Use Maclaurin series to evaluate each of the...Ch. 1.15 - Use Maclaurin series to evaluate each of the...Ch. 1.15 - Use Maclaurin series to evaluate each of the...Ch. 1.15 - Use Maclaurin series to evaluate each of the...Ch. 1.15 - Use Maclaurin series to evaluate each of the...Ch. 1.15 - Use Maclaurin series to evaluate each of the...Ch. 1.15 - Find a two term aproximation for each of the...Ch. 1.15 - Find a two term aproximation for each of the...Ch. 1.15 - Find the sum of each of the following series by...Ch. 1.15 - Find the sum of each of the following series by...Ch. 1.15 - Find the sum of each of the following series by...Ch. 1.15 - Find the sum of each of the following series by...Ch. 1.15 - By computer or tables, find the exact sum of each...Ch. 1.15 - By computer, find a numerical approximation for...Ch. 1.15 - The series n=11/n8,s1, is called the Riemann Zeta...Ch. 1.15 - Find the following limits using Maclaurin series...Ch. 1.15 - Evaluate the following indeterminate forms by...Ch. 1.15 - In general, we do not expect Maclaurin series to...Ch. 1.15 - Find the values of several derivatives of...Ch. 1.15 - The velocity of electrons from a high energy...Ch. 1.15 - The energy of an electron at speed in special...Ch. 1.15 - The figure shows a heavy weight suspended by a...Ch. 1.15 - Prob. 30PCh. 1.15 - A tall tower of circular cross section is...Ch. 1.15 - Show that the doubling time (time for your money...Ch. 1.15 - If you are at the top Of a tower Of height h above...Ch. 1.16 - Show that it is possible to stack a pile of...Ch. 1.16 - The picture is a mobile constructed of dowels (or...Ch. 1.16 - Show that n=21/n3/2 is convergent. What is wrong...Ch. 1.16 - Test for convergence: n=12nn!Ch. 1.16 - Test for convergence: n=2(n1)21+n2Ch. 1.16 - Test for convergence: n=2n1(n+1)21Ch. 1.16 - Test for convergence: n=21n1n(n)3Ch. 1.16 - Test for convergence: n=22n3n42Ch. 1.16 - Find the interval of convergence, including...Ch. 1.16 - Find the interval of convergence, including...Ch. 1.16 - Find the interval of convergence, including...Ch. 1.16 - Find the interval of convergence, including...Ch. 1.16 - Find the interval of convergence, including...Ch. 1.16 - Find the Maclaurin series for the folliwing...Ch. 1.16 - Find the Maclaurin series for the folliwing...Ch. 1.16 - Find the Maclaurin series for the folliwing...Ch. 1.16 - Find the Maclaurin series for the folliwing...Ch. 1.16 - Find the Maclaurin series for the folliwing...Ch. 1.16 - Find the few terms of the Taylor series for the...Ch. 1.16 - Find the few terms of the Taylor series for the...Ch. 1.16 - Find the few terms of the Taylor series for the...Ch. 1.16 - Use the series you know to show that:...Ch. 1.16 - Use the series you know to show that:...Ch. 1.16 - Use the series you know to show that:...Ch. 1.16 - Evaluate the limit limx0x2/1ncosx by series (in...Ch. 1.16 - Use Maclaurin to do Problem 26 to 29 and check...Ch. 1.16 - Use Maclaurin to do Problem 26 to 29 and check...Ch. 1.16 - Use Maclaurin to do Problem 26 to 29 and check...Ch. 1.16 - Use Maclaurin to do Problem 26 to 29 and check...Ch. 1.16 - It is clear that you (or your computer) cant find...Ch. 1.16 - As in Problem 30, for each of the following...
Additional Math Textbook Solutions
Find more solutions based on key concepts
In Exercises 13–22, find the limit of each rational function (a) as and (b) as . Write or – where appropriate...
University Calculus: Early Transcendentals (4th Edition)
1. You conduct a poll in which you randomly select 1000 registered voters from Texas and ask if they approve of...
Using and Understanding Mathematics: A Quantitative Reasoning Approach (6th Edition)
For a population containing N=902 individual, what code number would you assign for a. the first person on the ...
Basic Business Statistics, Student Value Edition
Two cards are randomly selected from an ordinary playing deck. What is the probability that they loin, a blackj...
A First Course in Probability (10th Edition)
The equivalent expression of x(y+z) by using the commutative property.
Calculus for Business, Economics, Life Sciences, and Social Sciences (14th Edition)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, subject and related others by exploring similar questions and additional content below.Similar questions
- Let A = {a, b, c, d}, B = {a,b,c}, and C = {s, t, u,v}. Draw an arrow diagram of a function for each of the following descriptions. If no such function exists, briefly explain why. (a) A function f : AC whose range is the set C. (b) A function g: BC whose range is the set C. (c) A function g: BC that is injective. (d) A function j : A → C that is not bijective.arrow_forwardLet f:R->R be defined by f(x)=x^(3)+5.(a) Determine if f is injective. why?(b) Determine if f is surjective. why?(c) Based upon (a) and (b), is f bijective? why?arrow_forwardLet f:R->R be defined by f(x)=x^(3)+5.(a) Determine if f is injective.(b) Determine if f is surjective. (c) Based upon (a) and (b), is f bijective?arrow_forward
- Please as many detarrow_forward8–23. Sketching vector fields Sketch the following vector fieldsarrow_forward25-30. Normal and tangential components For the vector field F and curve C, complete the following: a. Determine the points (if any) along the curve C at which the vector field F is tangent to C. b. Determine the points (if any) along the curve C at which the vector field F is normal to C. c. Sketch C and a few representative vectors of F on C. 25. F = (2½³, 0); c = {(x, y); y − x² = 1} 26. F = x (23 - 212) ; C = {(x, y); y = x² = 1}) , 2 27. F(x, y); C = {(x, y): x² + y² = 4} 28. F = (y, x); C = {(x, y): x² + y² = 1} 29. F = (x, y); C = 30. F = (y, x); C = {(x, y): x = 1} {(x, y): x² + y² = 1}arrow_forward
- ٣/١ B msl kd 180 Ka, Sin (1) I sin () sin(30) Sin (30) اذا ميريد شرح الكتب بس 0 بالفراغ 3) Cos (30) 0.866 4) Rotating 5) Synchronous speed, 120 x 50 G 5005 1000 s = 1000-950 Copper bosses 5kW Rotor input 5 0.05 : loo kw 6) 1 /0001 ined sove in peaper I need a detailed solution on paper please وه اذا ميريد شرح الكتب فقط ١٥٠ DC 7) rotor a ' (y+xlny + xe*)dx + (xsiny + xlnx + dy = 0. Q1// Find the solution of: ( 357arrow_forward۳/۱ R₂ = X2 2) slots per pole per phase 3/31 B. 180 msl Kas Sin (I) 1sin() sin(30) Sin (30) اذا ميريد شرح الكتب بس 0 بالفراغ 3) Cos (30): 0.866 4) Rotating 5) Synchronous speeds 120×50 looo G 1000-950 1000 Copper losses 5kw Rotor input 5 loo kw 0.05 6) 1 اذا ميريد شرح الكتب فقط look 7) rotor DC ined sove in peaper I need a detailed solution on paper please 0 64 Find the general solution of the following equations: QI//y(4)-16y= 0. Find the general solution of the following equations: Q2ll yll-4y/ +13y=esinx.arrow_forwardR₂ = X2 2) slots per pole per phase = 3/31 B-180 60 msl kd Kas Sin () 2 I sin (6) sin(30) Sin (30) اذا مريد شرح الكتب بس 0 بالفراغ 3 Cos (30) 0.866 4) Rotating ined sove in peaper 5) Synchronous speed s 120×50 6 s = 1000-950 1000 Copper losses 5kw Rotor input 5 0.05 6) 1 loo kw اذا ميريد شرح الكتب فقط Look 7) rotov DC I need a detailed solution on paper please 0 64 Solve the following equations: 0 Q1// Find the solution of: ( y • with y(0) = 1. dx x²+y²arrow_forward
- R₂ = X2 2) slots per pole per phase = 3/3 1 B-180-60 msl Ka Sin (1) Isin () sin(30) Sin (30) اذا ميريد شرح الكتب بس 0 بالفراغ 3) Cos (30) 0.866 4) Rotating 5) Synchronous speed, 120 x 50 s = 1000-950 1000 Copper losses 5kw Rotor input 5 6) 1 0.05 G 50105 loo kw اذا ميريد شرح الكتب فقط look 7) rotov DC ined sove in peaper I need a detailed solution on paper please 064 2- A hot ball (D=15 cm ) is cooled by forced air T.-30°C, the rate of heat transfer from the ball is 460.86 W. Take for the air -0.025 Wim °C and Nu=144.89, find the ball surface temperature a) 300 °C 16 b) 327 °C c) 376 °C d) None か = 750 01arrow_forwardAnswer questions 8.3.3 and 8.3.4 respectively 8.3.4 .WP An article in Medicine and Science in Sports and Exercise [“Electrostimulation Training Effects on the Physical Performance of Ice Hockey Players” (2005, Vol. 37, pp. 455–460)] considered the use of electromyostimulation (EMS) as a method to train healthy skeletal muscle. EMS sessions consisted of 30 contractions (4-second duration, 85 Hz) and were carried out three times per week for 3 weeks on 17 ice hockey players. The 10-meter skating performance test showed a standard deviation of 0.09 seconds. Construct a 95% confidence interval of the standard deviation of the skating performance test.arrow_forward8.6.7 Consider the tire-testing data in Exercise 8.2.3. Compute a 95% tolerance interval on the life of the tires that has confidence level 95%. Compare the length of the tolerance interval with the length of the 95% CI on the population mean. Which interval is shorter? Discuss the difference in interpretation of these two intervals.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw HillMathematics For Machine TechnologyAdvanced MathISBN:9781337798310Author:Peterson, John.Publisher:Cengage Learning,Holt Mcdougal Larson Pre-algebra: Student Edition...AlgebraISBN:9780547587776Author:HOLT MCDOUGALPublisher:HOLT MCDOUGAL
- Algebra & Trigonometry with Analytic GeometryAlgebraISBN:9781133382119Author:SwokowskiPublisher:CengageCollege Algebra (MindTap Course List)AlgebraISBN:9781305652231Author:R. David Gustafson, Jeff HughesPublisher:Cengage Learning

Glencoe Algebra 1, Student Edition, 9780079039897...
Algebra
ISBN:9780079039897
Author:Carter
Publisher:McGraw Hill

Mathematics For Machine Technology
Advanced Math
ISBN:9781337798310
Author:Peterson, John.
Publisher:Cengage Learning,

Holt Mcdougal Larson Pre-algebra: Student Edition...
Algebra
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL

Algebra & Trigonometry with Analytic Geometry
Algebra
ISBN:9781133382119
Author:Swokowski
Publisher:Cengage

College Algebra (MindTap Course List)
Algebra
ISBN:9781305652231
Author:R. David Gustafson, Jeff Hughes
Publisher:Cengage Learning
Type I and II Errors, Power, Effect Size, Significance and Power Analysis in Quantitative Research; Author: NurseKillam;https://www.youtube.com/watch?v=OWn3Ko1WYTA;License: Standard YouTube License, CC-BY