Algebra 2 Common Core

Published by Prentice Hall
ISBN 10: 0133186024
ISBN 13: 978-0-13318-602-4

Chapter 14 - Trigonometric Identities and Equations - 14-1 Trigonometric Identities - Practice and Problem-Solving Exercises - Page 908: 32



Work Step by Step

Simplify $$\sin^{2}\theta +\cos^{2}\theta +\tan^{2}\theta.$$ Use the Pythagorean Identity $$\sin^{2}\theta+\cos^{2}\theta=1$$ to obtain $$\sin^{2}\theta +\cos^{2}\theta +\tan^{2}\theta=1+\tan^{2}\theta.$$ Finally, use the Pythagorean Identity $$1+\tan^{2}\theta=\sec^{2}\theta$$ to obtain $$\sin^{2}\theta +\cos^{2}\theta +\tan^{2}\theta=\sec^{2}\theta.$$
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