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Question

Prove that:
cotAcosAcotA+cosA=cosecA1cosecA+1

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Solution

LHS=cotAcosAcotA+cosA
=cosAsinAcosAcosAsinA+cosA
=cosA(1sinA1)cosA(1sinA+1)
=1sinA11sinA+1
=cosecA1cosecA+1=RHS

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