Prove the identity sin (a+ B) + sin (a-B) = 2 sin a cos B. ....

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section: Chapter Questions
Problem 14RE
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Prove the identity sin (a+ B) + sin (a-B) =2 sin a cos B.
To verify the identity, start with the left side and transform it to look like the right side. Choose the correct transformations and transform the expression at each step.
sin (a+ B) + sin (a-B)
= sin a cos B+ cos a sin B+ sin a cos B- cos a sin BUse sum and difference identities.
= 2 sin a cos ß
Combine like terms.
Time Remain
Click to select your answerts).
Transcribed Image Text:Prove the identity sin (a+ B) + sin (a-B) =2 sin a cos B. To verify the identity, start with the left side and transform it to look like the right side. Choose the correct transformations and transform the expression at each step. sin (a+ B) + sin (a-B) = sin a cos B+ cos a sin B+ sin a cos B- cos a sin BUse sum and difference identities. = 2 sin a cos ß Combine like terms. Time Remain Click to select your answerts).
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