Answer
$f'(0)=0$
Work Step by Step
$f(x)=\frac{\sin(x)}{\cos(x)}\frac{\cos(x)}{\sin(x)}=1$.
$f'(x)=0\rightarrow f'(1)=0$
Calculus 10th Edition
by Larson, Ron; Edwards, Bruce H.
Published by
Brooks Cole
ISBN 10:
1-28505-709-0
ISBN 13:
978-1-28505-709-5
Chapter 2 - Differentiation - 2.3 Exercises - Page 126: 60
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