1÷1+cos A +1÷1-Cos A =2Cosec×cosec A
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Step-by-step explanation:
1 / 1+cosA + 1 / 1 - cosA = ( 1 -cosA + 1+ cosA ) / (1+cosA) (1-cosA)
= 2 / 1- cos²A
= 2 / sin²A
= 2 cosec²A
= 2 cosecA x cosecA
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