Mathematics, 25.11.2019 07:31 Winzen07

If \cos \theta = \frac{3}{5}cosθ=53, then what is the positive value of \sin\tfrac{1}{2}\thetasin21θ, in simplest radical form with a rational denominator?

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If \cos \theta = \frac{3}{5}cosθ=53, then what is the positive value of \sin\tfrac{1}{2}...