$\lim_{x\to-infinity}\left(15xe^x\right)$
$\left(3x\right)\:\left(-5x\right)$
$49r^2-81p^2$
$\sin\left(\frac{15}{17}+\frac{4}{3}\right)$
$\frac{dy}{dx}=y-3e$
$\int\left(\left(12x^2-12x^3\right)-\left(2x^2-2x\right)\right)dx$
$b^2-a^2b+ab$
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