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Question

Prove that
cotAcosAcotA+cosA=cosecA1cosecA+1

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Solution

cotAcosAcotA+cosA=cosecA1cosecA+1
cosAsinAcosAcosAsinA+cosA=cosA(1sinA1)cosA(1sinA+1)
cosecA1cosec+1

1205907_1106270_ans_764a0d5d40994a18a608765be67829b7.jpg

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