Prove that tanA/2=√(1-cosA)/(1+cosA)

Steps to prove tanA/2=√(1-cosA)/(1+cosA)

Take R.H.S √(1-cosA)/(1+cosA)

=√(1-cosA)/(1+cosA)

=√(2sin^2A/2)/(2cos^2A/2)

=√tan^2A/2

=tanA/2

=R.H.S

Hence tanA/2=√(1-cosA)/(1+cosA) is proved.

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