pottersheep
  • pottersheep
Grade 12 Trig Identities trouble....help please... I'm not sure how to prove that ((sin2x/(1+cos2x)) * (cosx)/(1+cosx) = tan(x/2)
Mathematics
jamiebookeater
  • jamiebookeater
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sirm3d
  • sirm3d
try the double angle formulas \[\large \sin 2x=2\sin x \cos x\]and\[\large \cos 2x = 2\cos^2 x -1\]
pottersheep
  • pottersheep
Yep that's what I have tried out...I keep getting stuck though
pottersheep
  • pottersheep
because one side is tan(x/2)

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anonymous
  • 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
pottersheep
  • pottersheep
Thank you very much I will go take a look

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