f(9(x))g'(x)dx = / f(t)dt. g(a)

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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(Change-of-variable Formula). Let g : [a, b] → R be differentiable and assume g is continuous. Let f : [c, d] → R be continuous, and assume that the range of g is contained in [c, d] so that the composition f ◦ g is properly defined.
(a) Why are we sure f is the derivative of some function? How about (f ◦g)g?
(b) Prove the change-of-variable formula

f(9(x))g'(x)dx = / f(t)dt.
g(a)
Transcribed Image Text:f(9(x))g'(x)dx = / f(t)dt. g(a)
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