cosec (A+B ) = cosecA cosecB /
cotA+ cotB
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Answer:
(cosecA.cosecB + cotA.cotB)square - (cosecA.cotB + cosecB.cotA) square
= cosec^2A.cosec^2B + cot^2A.cot^2B + 2cosecA.cosecB.cotA.cotB
-- cosec^2A.cot^2B -- cosec^2B.cot^2A -- 2cosecA.cotB.cosecB.cotA
= cosec^2A.cosec^2B + cot^2A.cot^2B -- cosec^2A.cot^2B -- cosec^2B.cot^2A --
= cosec^2A [cosec^2B -- cot^2B] -- cot^2A [cosec^2B -- cot^2B]
= cosec^2A -- cot^2A
= 1 ANSWER
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