$-\int\:x^2e^{-x}dx$
$g\left(x\right)=-2x^4+x^2-3x$
$\left(2x\right)\left(x\right)+\left(5x\right)-\left(3\right)\left(2x\right)-\left(3\right)\left(5\right)$
$f\left(x\right)=\left(3x^2-6\right)^3$
$7\cdot0.8$
$6x>20$
$\int-\frac{1}{2}x^2\cdot e^{-2x}$
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