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Math Help - Integration

  1. #1
    Junior Member
    Joined
    Sep 2009
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    56

    Integration

    hey ppl, need help with this one: \int \frac{\ln (x^2-4)}{\sqrt{x^2-4}}dx. Tried parts, but it got too messy in the end. Any ideas?
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  2. #2
    Senior Member
    Joined
    Jan 2009
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    290
    Have you tried trigonometric substitution?
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  3. #3
    Junior Member
    Joined
    Sep 2009
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    yeah, by substituting x=2\sec\theta, i ended up with 2\int \ln (2\tan\theta)\sec\theta d\theta.

    Would there be another way to solve this question?
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