Prove that cot theta minus 10 theta equal to 2 cos squared theta minus 1 / sin theta cos theta
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LHS = cot theta - tan theta= 2cos^2theta -1/ sin theta . cos theta
cos theta - sin theta
_______ ________
sin theta cos theta
Cos^2 theat - sin^2 theta
__________ _________
sin theta . cos theta
Cos^2 theta + cos^2 theta -1
__________ ___________
sin theta . cos theta
2 cos^2 theta -1
_______________ =RHS
sin theta . cos theta
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