$\int5x^3e^{-2x}dx$
$\left(2x^2+5a^2y\right)\left(2x^2-5a^{2y}\right)$
$-3\:\:x\:-17$
$\left(-2d+9\right)\left(9d-2\right)$
$\left(-6\right)-\left(-1\right)$
$\int6x^3e^{4x}dx$
$\lim_{x\to0}\left(\frac{e^x-e^{-x}-2x}{\sin\left(x\right)}\right)$
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