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Trigonometry
Trigonometric Functions
Trigonometric Identities
Given:cos(2theta)=7/25, pi <theta<3pi/2 find sin theta
1 answer
sin^2θ = (1-cos2θ)/2 = (1 - 7/25)/2 = 9/25
sinθ = ±3/5
So which is it?
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