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Math Help - [SOLVED] Integration difficulty

  1. #1
    bellycan
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    [SOLVED] Integration difficulty

    I can't get my head round this one:

    int (1/x^2)*e^(1/x^2)

    I know I need to use substitution but if I use u=1/x the derivative doesn't seem to help and the same if I use u=1/x^2

    Any help appreciated
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  2. #2
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    Quote Originally Posted by bellycan View Post
    I can't get my head round this one:

    int (1/x^2)*e^(1/x^2)

    I know I need to use substitution but if I use u=1/x the derivative doesn't seem to help and the same if I use u=1/x^2

    Any help appreciated
    Let t=1/x then,
    -\int e^{t^2}dt

    Which is not "doable".
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  3. #3
    Junior Member
    Joined
    Jan 2007
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    42

    is it a definite integral

    Quote Originally Posted by bellycan View Post
    I can't get my head round this one:

    int (1/x^2)*e^(1/x^2)

    I know I need to use substitution but if I use u=1/x the derivative doesn't seem to help and the same if I use u=1/x^2

    Any help appreciated



    if you have 0 to infinity as limits you might end up with the gamma integral
    after suitable substitutions
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