How do i integrate (y^2)(cos3y)dy ?
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Originally Posted by kandyfloss How do i integrate (y^2)(cos3y)dy ? integration by parts (twice), or the tabular method, if you've learned it take $\displaystyle u = y^2$ and $\displaystyle dv = \cos 3y ~dy $ in the integration by parts formula $\displaystyle \left( \int u~dv = uv - \int v~du \right)$
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