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Math Help - Evaluate the Integral

  1. #1
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    Evaluate the Integral



    I ended up with 9/8xsin(8x)-9/8sin(8x) and am not sure what am i missing.


    On a side note, how can I input that problem into Wolfram Mathematica? I tried Integrate[9xCos(8x) dx, x] and it gave me a strange value.
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  2. #2
    MHF Contributor Drexel28's Avatar
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    Quote Originally Posted by masterofcheese View Post


    I ended up with 9/8xsin(8x)-9/8sin(8x) and am not sure what am i missing.


    On a side note, how can I input that problem into Wolfram Mathematica? I tried Integrate[9xCos(8x) dx, x] and it gave me a strange value.
    What method did you use?

    P.S. Try "integrate 9*x*cos(8*x)"
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  3. #3
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    Oh, sorry, forgot to say, but this is integration by parts.
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