SOLUTION: Prove 1-tan^2 x/2 = 2cosx/ 1+ cosx
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Question 928604
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Prove 1-tan^2 x/2 = 2cosx/ 1+ cosx
Answer by
lwsshak3(11628)
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Prove 1-tan^2 x/2 = 2cosx/ 1+ cosx
start with left side:
Identity: tan(x/2)=sinx/(1+cosx)
verified: left side=right side