$\int\:4x^2\:e^x\:\:dx$
$\left(2x^2-2x+6\right)\left(3x^2-5x-9\right)$
$\int\left(\frac{5e^{-3y}}{e^{-3y}-6}\right)dy$
$\lim_{x\to-1}\left(2x-5\right)$
$y=x^2-4x$
$3\cdot3^2\cdot3^{-3}\cdot3^5\cdot3^5$
$-2+4+4-7y^2+2y^2-2x^2+x^2$
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