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(tan a+cot a)^2=sec^2 a+cosec^2 a |
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Answer» LHS: tan^2a+ cot^a+2tana.cota =tan^2a+ cot^2a +2tana.1/tana =tan^2a+cot^2a+2 =tan^2a+1 +cot^2a+1 =sec^2a+cosec^2a =rhs |
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