Prove that 1-cos theta/1+cos theta =1tan^2 theta/2
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(1 - Cos θ) / (1 + Cos θ)
= 2 Sin² θ/2 / 2 Cos² θ
= Tan² θ /2
= 2 Sin² θ/2 / 2 Cos² θ
= Tan² θ /2
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my answer is correct.... in the second line it is Cos² θ/2 and not Cos² θ
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