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Question

( CosecA - CotA )^2 = 1 - CosA / 1+ CosA , prove that.

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Solution

LHS ( cosecA - cotA )² = ( 1/ sinA - cosA/sinA )² = ( 1 - cosA/ sinA )² = ( 1 + cosA )²/ sin²A = ( 1 - cosA )²/ 1 - cos²A = ( 1 - cosA ) ( 1 - cosA )/ ( 1 + cosA ) ( 1 - cosA ) = 1 - cosA / 1 + cosA .°. RHS

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