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Math Help - Integrating

  1. #1
    Senior Member
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    Jul 2007
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    290

    Integrating

    I'm not too sure how to integrate

    sqrt ( 1 + 9(cos3t)^2)

    Any help is appreciated. Thanks
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  2. #2
    Senior Member Peritus's Avatar
    Joined
    Nov 2007
    Posts
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    This integrand doesn't have a simple primitive function, actually it's an elliptical integral.
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