Suppose we were instead asked to calculate the integral x sin(x) dx. Can you calculate this integral using the method of substitution?

Algebra and Trigonometry (6th Edition)
6th Edition
ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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Recall. We've already seen that the method of u-substitution can help us integrate some products of functions, e.g. to
calculate the integral
/ x sin(x²) dx,
we can make the substitution u =x', du = 2x dx to get
1
1
cos(u) + C = -
2
: = --cos(x*) + C.
1
x sin(x?) dx =
sin(u)
du
2
Suppose we were instead asked to calculate the integral
x sin(x) dx.
Can you calculate this integral using the method of substitution?
No! Substitution does not help us in this case.
b. Yes, substituting u = sin(x) allows us to calculate the integral!
Oc. Yes, substitution u = x sin(x) allows us to calculate the integral!
d. Yes, substituting u = x allows us to calculate the integral!
Transcribed Image Text:Recall. We've already seen that the method of u-substitution can help us integrate some products of functions, e.g. to calculate the integral / x sin(x²) dx, we can make the substitution u =x', du = 2x dx to get 1 1 cos(u) + C = - 2 : = --cos(x*) + C. 1 x sin(x?) dx = sin(u) du 2 Suppose we were instead asked to calculate the integral x sin(x) dx. Can you calculate this integral using the method of substitution? No! Substitution does not help us in this case. b. Yes, substituting u = sin(x) allows us to calculate the integral! Oc. Yes, substitution u = x sin(x) allows us to calculate the integral! d. Yes, substituting u = x allows us to calculate the integral!
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