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Math Help - definite integral

  1. #1
    sss
    sss is offline
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    definite integral

    .








    ..FIng g(u) ,a,b and the integral
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  2. #2
    Member Jason Bourne's Avatar
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    \int_{\frac{\pi}{6}}^{\frac{\pi}{2}} \frac{cosx}{sin^7x}dx = \int_{sin(\frac{\pi}{6})}^{1} \frac{1}{u^7}du

    by using the substitution u = sin(x)
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  3. #3
    Member Jason Bourne's Avatar
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    Quote Originally Posted by sss View Post
    .

    \int_1^{e^8} \frac{dx}{x\sqrt{lnx}} = \int_0^{8} \frac{du}{\sqrt{u}}

    using the substitution u =ln(x)

    I think you could do the other integral by parts
    Last edited by Jason Bourne; December 1st 2008 at 12:17 PM.
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