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Thread: Trig Identities Help

  1. January 26th 2009, 02:17 PM #1
    DaCoo911
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    Exclamation Trig Identities Help

    I'm stuck on this question. I jest keep getting a really long answer that goes nowhere. THanks in advance.
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  2. January 26th 2009, 03:00 PM #2
    Danny
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    Quote Originally Posted by DaCoo911 View Post
    I'm stuck on this question. I jest keep getting a really long answer that goes nowhere. THanks in advance.
    LS = \frac{\cos x - \sin x}{\cos x + \sin x}\cdot \frac{\cos x - \sin x}{\cos x - \sin x} = \frac{\cos^2 x - 2 \sin x \cos x + \sin^2 x}{\cos^2 x-\sin^2 x} = \frac{1 - \sin 2x}{\cos 2x}

    =\frac{1}{\cos 2x} - \frac{\sin2x}{\cos 2x} = RS
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