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Math Help - trig prove

  1. #1
    Member srirahulan's Avatar
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    Post trig prove

    cosecA+cosec2A+cosec4A=cot\frac{A}{4}-cot4A
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  2. #2
    MHF Contributor Reckoner's Avatar
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    Re: trig prove

    Quote Originally Posted by srirahulan View Post
    cosecA+cosec2A+cosec4A=cot\frac{A}{4}-cot4A
    This is not true in general. Try, for example, A=\frac\pi3.
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