If `sintheta=1/2`, show that `(3costheta - 4cos^3theta)=0`

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If ` sin alpha =(1)/(2) ,` prove that `(3 cos alpha - 4 cos ^(3) alpha )=0.`

If ` sin theta = 1/2 and theta ` is acute then ` (3 cos theta -4 cos^(3) theta)` is equal to

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