Answer
$$ u=\cos x^{2}\Longrightarrow du =-2x \sin x^2 dx .$$
Work Step by Step
Recall that $(\cos x)'=-\sin x$.
Recall that $(x^n)'=nx^{n-1}$
$$ u=\cos x^{2}\Longrightarrow du =-2x \sin x^2 dx .$$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 5 - The Integral - 5.7 Substitution Method - Exercises - Page 275: 3
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