5. Prove the identity: cot(A + B) cot(A − B) = = cot² B tan² A tan² A cot² B - 1 3.1

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.3: The Addition And Subtraction Formulas
Problem 49E
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5. Prove the identity: cot(A + B) cot(A − B) =
=
cot² B - tan² A
tan² A cot² B – 1˚
3.1
Transcribed Image Text:5. Prove the identity: cot(A + B) cot(A − B) = = cot² B - tan² A tan² A cot² B – 1˚ 3.1
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