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Math Help - Value of this indefinite integral

  1. #1
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    Exclamation Value of this indefinite integral

    Can you help me please?
    Which is the value of this integral?

     <br />
\displaystyle\int_{0}^{\infty}\displaystyle\frac{l  nx}{1+x^2}dx<br />

    Thanks
    Last edited by osodud; December 7th 2009 at 06:23 PM.
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  2. #2
    MHF Contributor Bruno J.'s Avatar
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    That's a definite integral.

    What is lu(x)? Did you mean ln(x)?
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  3. #3
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    it's finite and its value is zero.

    put x=\frac1t.
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  4. #4
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    Quote Originally Posted by Bruno J. View Post
    That's a definite integral.

    What is lu(x)? Did you mean ln(x)?
    Yes you are right

    Can you help me?
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  5. #5
    MHF Contributor Bruno J.'s Avatar
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    Quote Originally Posted by Krizalid View Post
    it's finite and its value is zero.

    put x=\frac1t.

    Slick! Try it, osodud.
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