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1-tan²A/cot²A-1=tan²A...Prove |
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Answer» tan2x−cot2x=sin2xcos2x−cos2xsin2x =sin4x−cos4xcos2xsin2x =sin2x−cos2xcos2xsin2x =1cos2x−1sin2x =SEC2X−csc2x =sec2x(1−csc2xsec2x) =sec2x(1−cos2xsin2x) =sec2x(1−cot2x). |
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