Answer
$cot(-x)$ is not equal to $cot~x$
Work Step by Step
$cot(-x)=-cot~x$
$\frac{1}{tan~x}+cot(-x)=cot~x-cot~x=0$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 7 - 7.2 - Verifying Trigonometric Identities - 7.2 Exercises - Page 521: 43
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