Hi, I am still bad in integration, I do not know which way to choose, integration by part or substination. integration x^2cos(x) So I shoul do like this integration x^2cos(x)=x^2 (-sinx)-integration2x (-sinx)
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Yes do that and then do integration by parts again. $\displaystyle \displaystyle u=2x, \ du=2dx, \ dv=-sin(x), \ v=cos(x)$ $\displaystyle \displaystyle x^2*cos(x)-\left[2x*cos(x)-\int 2cos(x)dx\right]$
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