Answer
True.
$cos(θ-\frac{\pi}{2})=sin~θ$
Work Step by Step
$cos~x$ is an even function. So, $cos(θ-\frac{\pi}{2})=cos(\frac{\pi}{2}-θ)=sin~θ$
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: 64
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