Answer
$cot^2u$
Work Step by Step
Use the identity:
$cos^2u+sin^2u=1~~$ (Divide both sides by $sin^2u$)
$\frac{cos^2u}{sin^2u}+\frac{sin^2u}{sin^2u}=\frac{1}{sin^2u}$
$cot^2u+1=csc^2u$
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 520: 6
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