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Math Help - Stuck on simple integration by parts

  1. #1
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    Stuck on simple integration by parts

    How do I integrate sinx.cos3x


    Imunable to reach the final answer: 3/2cos^2(x) - cos^4(x) + C
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  2. #2
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    Quote Originally Posted by DeRSeD View Post
    How do I integrate sinx.cos3x


    Imunable to reach the final answer: 3/2cos^2(x) - cos^4(x) + C
    Wolfram|Alpha

    Be sure to click on Show Steps. (And you'll need to show that the two answers are equivalent).

    If you have to use integration by parts (and it has to be used twice), please show all your working and say where you get stuck.
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