Answer
12
Work Step by Step
According to the chain rule,
$\frac{df}{dx}=\frac{df}{du}\times\frac{du}{dx}=2\times6=12$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 3 - Differentiation - 3.7 The Chain Rule - Exercises - Page 146: 9
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