plz solve it . cot theta - tan theta = 2cos square theta -1 / sin theta. cos theta
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cos thetha /sin theta -sin theta /cos theta
(cos^2 theta-sin^2theta)/sin theta cos theta
2cos^2-1/sin theta cos theta
(cos^2 theta-sin^2theta)/sin theta cos theta
2cos^2-1/sin theta cos theta
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