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Math Help - emergency integral help.

  1. #1
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    emergency integral help.

    I"m doing a worksheet on integrals, and i have absolutely no idea whatsoever how to do the following problems.

    sinx/1+x^2 (interval 1, -1)

    1/2-3x (interval 2, 0)

    x/x^2-4 (interval 10, 1)

    csc^2dt

    sinxcos(cosx)
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  2. #2
    Like a stone-audioslave ADARSH's Avatar
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    Quote Originally Posted by brittneyymariee View Post
    I"m doing a worksheet on integrals, and i have absolutely no idea whatsoever how to do the following problems.
    Show your working
    First of all your questions show that you haven't studied integrals at all
    So the first suggestion is read the books/materials before solving the questions directly


    sinx/1+x^2 (interval 1, -1)

    Read integration by parts

    1/2-3x (interval 2, 0)
    Read integration by substitution
    You will have to substitute 2-3x by t

    x/x^2-4 (interval 10, 1)
    substitute x^2-4 by t

    cosec^2dt
    what's differntiation of cot(x)

    sinxcos(cosx)
    Read this
    and try it
    Last edited by ADARSH; February 19th 2009 at 03:47 AM.
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  3. #3
    Math Engineering Student
    Krizalid's Avatar
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    But we're dealing with improper integrals here.

    brittneyymariee, have you covered improper integrals?
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