2sin(−5α)cos(−2α)+2sin(−2α)cos(−5α)=−2

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.2: Trigonometric Equations
Problem 57E
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Find all solutions to the equation below in the interval (−2/7π,0).
Give all answers as exact values in a list, separated by commas.

2sin(−5α)cos(−2α)+2sin(−2α)cos(−5α)=−2


α =   

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