If tanx=-1/3 then cosx>0 Find Sin2x,cos2x and tan2x

Trigonometry (MindTap Course List)
10th Edition
ISBN:9781337278461
Author:Ron Larson
Publisher:Ron Larson
Chapter2: Analytic Trigonometry
Section2.3: Solving Trigonometric Equations
Problem 9ECP: Solve 4tan2x+5tanx6=0.
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If tanx=-1/3 then cosx>0

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Sin2x,cos2x and tan2x

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