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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. sirm3d
    • 3 years ago
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    try the double angle formulas \[\large \sin 2x=2\sin x \cos x\]and\[\large \cos 2x = 2\cos^2 x -1\]

  2. pottersheep
    • 3 years ago
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    Yep that's what I have tried out...I keep getting stuck though

  3. pottersheep
    • 3 years ago
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    because one side is tan(x/2)

  4. chaguanas
    • 3 years ago
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    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
    • 3 years ago
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    Thank you very much I will go take a look

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