Prove the identity. cos = -sin e We begin on the left side of the equation by using a Sum Formula. We can then find all exact values and simplify. + e = cos cos 2 cos e – sin sin e Cos e - sin e sin e

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.3: The Addition And Subtraction Formulas
Problem 62E
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Prove the identity.
cos
+ e
= -sin e
We begin on the left side of the equation by using a Sum Formula. We can then find all exact values and simplify.
co ) - cos cos 0 - sin
+ e
sin e
= COS
2
cos e
sin e
= -sin e
Transcribed Image Text:Prove the identity. cos + e = -sin e We begin on the left side of the equation by using a Sum Formula. We can then find all exact values and simplify. co ) - cos cos 0 - sin + e sin e = COS 2 cos e sin e = -sin e
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