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Math Help - equality trigonometry

  1. #1
    arm
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    equality trigonometry

    Let a, b ≠kπ : a.sin\alpha a\sin\alpha +b. cos\alpha b\cos\alpha = a.sin\beta a\sin\beta +b. cos\beta b\cos\beta =c.

    Prove: cos^{2}\frac{\alpha- \cos^{2}\frac{\alpha- \beta }{2}=\frac{c^{2}}{a^{2}+b^{2}}.
    Last edited by mr fantastic; February 26th 2011 at 01:06 PM. Reason: Fixed latex tags.
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  2. #2
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    Quote Originally Posted by arm View Post
    Let a, b ≠kπ : $a.sin\alpha a\sin\alpha +b. cos\alpha b\cos\alpha = a.sin\beta a\sin\beta +b. cos\beta b\cos\beta =c$.

    Prove: $cos^{2}\frac{\alpha- \cos^{2}\frac{\alpha- \beta }{2}=\frac{c^{2}}{a^{2}+b^{2}}$
    Hi arm,

    When you type Latex commands always use the [ math][ /math] to wrap them.
    Last edited by Sudharaka; February 25th 2011 at 01:50 AM. Reason: math tabs not seen
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  3. #3
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    Quote Originally Posted by arm View Post
    Let a, b ≠kπ : a.sin\alpha a\sin\alpha +b. cos\alpha b\cos\alpha = a.sin\beta a\sin\beta +b. cos\beta b\cos\beta =c.

    Prove: cos^{2}\frac{\alpha- \cos^{2}\frac{\alpha- \beta }{2}=\frac{c^{2}}{a^{2}+b^{2}}.
    The formatting of what you're trying to prove is unreadable (I am not going to bother editing it to what it should be - you can re-post it in this thread).

    To get help you need to show some effort. Show your work and say where you're stuck.
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