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Math Help - integration no.6

  1. #1
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    integration no.6

    integration no.6
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  2. #2
    MHF Contributor red_dog's Avatar
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    We have \cos(n-1)x=\cos(nx-x)
    and use \cos(a-b)=\cos a\cos b+\sin a\sin b
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  3. #3
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    here it is?
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