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Question

Prove 1+cosAsinA+sinA1+cosA=2cosec A

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Solution

L.H.S. =1+cosAsinA+sinA1+cosA

=(1+cosA)(1+cosA)+sinAsinAsinA(1+cosA)

=(1+cosA)2+sin2A(1+cosA)sinA

=1+cos2A+2cosA+sin2A(1+cosA)sinA

=1+2cosA+1(1+cosA)sinA

=2+2cosA(1+cosA)sinA

=2(1+cosA)(1+cosA)sinA

=21sinA

=2cosecA

=R.H.S

Hence proved.

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