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Math Help - Need help with a proof

  1. #1
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    Need help with a proof

    Been trying to do this proof for a while and I can't seem to solve it:
    Solve by using pythagorean identities:

    sinx/1-cosx + sinx/1+cosx = 2cscx

    Help much appreciated.
    Last edited by kyle0671; December 1st 2012 at 11:56 AM.
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  2. #2
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    Re: Need help with a proof

    Ill get you started

    LHS:
     \sin(x) \left ( \frac{1}{1-\cos(x)} + \frac{1}{1+\cos(x)} \right)

      \sin(x) \left [ \frac{1+\cos(x) + 1 -\cos(x)}{(1-\cos(x))(1+\cos(x))} \right]

    Don't forget the most important trig identity
     \sin(x)^2 + \cos(x)^2 = 1
    Last edited by Scopur; December 1st 2012 at 12:30 PM.
    Thanks from kyle0671
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  3. #3
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    Re: Need help with a proof

    Thanks for the help. Got it solved
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