2. (a) Prove that sin (A+B) cos B-cos (A+B) sin B=sin A. sin (A+B) (b) Hence, or otherwise, prove that sin Asin B cos (A+B) sin A cos B -=csc B sec B

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 21E
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PLs help ASAP. Pls show all work and steps. Pls circle the final answer also.

2.
(a) Prove that
sin (A+B) cos B-cos (A+B) sin B=sin A.
sin (A+B)
(b) Hence, or otherwise, prove that
sin Asin B
cos (A+B)
sin A cos B
-=csc B sec B
Transcribed Image Text:2. (a) Prove that sin (A+B) cos B-cos (A+B) sin B=sin A. sin (A+B) (b) Hence, or otherwise, prove that sin Asin B cos (A+B) sin A cos B -=csc B sec B
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