Prove that cotA/2=sinA/1-cosA

Steps to prove cotA/2=sinA/1-cosA

Take R.H.S

=sinA/1-cosA

We know that 2.sinA/2.cosA/2=sinA

and 2sin^2A/2=1-cosA

=(2.sinA/2.cosA/2)/(2sin^2A/2)

=(cosA/2)/(sinA/2)

=tanA/2

=L.H.S

Hence cotA/2=sinA/1-cosA is proved.

Detail Information:-

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