Answer
See below.
Work Step by Step
We know that $\sin^2\theta+\cos^2\theta=1$. Hence if we add the two equations we obtain the required equation.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 14 Trigonometric Graphs, Identities, and Equations - 14.3 Verify Trigonometric Identities - 14.3 Exercises - Problem Solving - Page 930: 45a
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