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Math Help - Integration problem

  1. #1
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    Integration problem

    How do i integrate (y^2)(cos3y)dy ?
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by kandyfloss View Post
    How do i integrate (y^2)(cos3y)dy ?
    integration by parts (twice), or the tabular method, if you've learned it

    take u = y^2 and dv = \cos 3y ~dy in the integration by parts formula \left( \int u~dv = uv - \int v~du \right)
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