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## pottersheep 3 years ago Grade 12 Trig Identities trouble....help please... I'm not sure how to prove that ((sin2x/(1+cos2x)) * (cosx)/(1+cosx) = tan(x/2)

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1. anonymous

try the double angle formulas $\large \sin 2x=2\sin x \cos x$and$\large \cos 2x = 2\cos^2 x -1$

2. pottersheep

Yep that's what I have tried out...I keep getting stuck though

3. pottersheep

because one side is tan(x/2)

4. anonymous

I've tried it and find what I think is the answer. See if you can find it; I used this page http://www.sosmath.com/trig/douangl/douangl.html

5. pottersheep

Thank you very much I will go take a look

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