Use a sum or difference formula to find the exact value of atrigonometric function.

Trigonometry (MindTap Course List)
8th Edition
ISBN:9781305652224
Author:Charles P. McKeague, Mark D. Turner
Publisher:Charles P. McKeague, Mark D. Turner
Chapter2: Right Triangle Trigonometry
Section: Chapter Questions
Problem 5GP
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Use a sum or difference formula to find the exact value of a
trigonometric function.

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