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Question

Prove that cosAsinA+1cosA+sinA1=cosecA+cotA .

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Solution

LHS=cosAsinA+1cosA+sinA1

dividing Nr and Dr by sinA we get,

=cosAsinAsinAsinA+1sinAcosAsinA+sinAsinA1sinA

=cotA1+cosecAcotA+1cosecA

=cotA+cosecA(cosec2Acot2A)cotA+1cosecA

=(cotA+cosecA)(1cosecA+cotA)cotA+1cosecA

=cotA+cosecA=RHS

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