Answer
$$\frac{dz}{dt}=\frac{6\pi}{(e^{\pi t}+2e^{-\pi t})^2}$$
Work Step by Step
The step by step is:
Calculus 8th Edition
by Stewart, James
Published by
Cengage
ISBN 10:
1285740629
ISBN 13:
978-1-28574-062-1
Chapter 14 - Partial Derivatives - 14.5 The Chain Rule - 14.5 Exercises - Page 983: 2
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