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Math Help - function

  1. #1
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    function

    how do I write tan^2(t/2) as a function of cost, where tan^2(t/2)=f(cost)?
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  2. #2
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    Try the identity:

    tan^{2}(u)=\frac{1-cos(2u)}{1+cos(2u)}
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  3. #3
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    thanks, I'll try that.
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  4. #4
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    so.. I get 1-cost/1+cost, but then I'm rather lost again.. do i multiply both with 1-cost...?
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  5. #5
    Eater of Worlds
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    It's entirely in terms of cosine. That's it, isn't it?.

    Don't you get: \frac{1-cos(t)}{1+cos(t)}?.
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  6. #6
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    yeah, that's what I meant.. but if the answer's supposed to be a polynomial?
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