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Thread: Trigonometry demonstration

  1. June 19th 2009, 10:20 AM #1
    dhiab
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    Trigonometry demonstration

    Prove :
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  2. June 19th 2009, 11:56 PM #2
    malaygoel
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    Hint:
    cos3\theta=-cos4\theta
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« Trig Equations | simplify trig expression »

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