$\frac{9^{3}\cdot9^{4}}{9^{2}}\cdot9^{3}$
$-12x-\left(-6-7x\right)$
$\frac{dy}{dx}\left(x^5y-x-7y-1\right)$
$\int15e^xdx$
$2x+1+x+1+2x+1+6x+2$
$\cos^2\left(x\right)\sin\left(2x\right)$
$\lim\:_{x\to\:-\infty}\:\frac{x^2}{e^{-x}}$
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