prove that 2cos²-1/sin0cos0=cot0-tan0
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RHS = cos theta / sin theta - sin theta / cos theta
= cos^2 theta - sin^2 theta / sin theta cos theta
= cos^2 theta - ( 1 - cos^2 theta )/ sin theta cos theta
= 2 cos^2 theta - 1 / sin theta cos theta
= LHS
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