Answer
1
Work Step by Step
It comes from the pythagorean theorem applied to a circle of radius 1. The catheti are $sin~x$ and $cos~x$, and the hypotenuse is $1$ (the radius).
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 7 - 7.1 - Using Fundamental Identities - 7.1 Exercises - Page 513: 5
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