`int xe^-x dx `
We know that:
`int xe^(ax) dx = (x/a -1/a^2)e^(ax) `
`==gt int xe^(-x) dx `
`= (x/(-1) - 1/(-1^2))e^(-x) + C `
`= (-x -1)e^-x + C `
`= -(x+1)e^(-x) + C `
`= -(x+1)/e^x + C`
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