$\lim_{x\to-\infty}\left(\arctan\frac{x^5+1}{x^4+1}\right)$
$\frac{x^{-3}\cdot y^{-1}\cdot z^{-1}}{2x^{-3}\cdot y^{-1}}$
$15cm\:\cdot35$
$\int e^{x-1}dx$
$9m^2+3m-15m^2$
$\frac{dy}{dx}=-5xy-1$
$7x^2\cdot7$
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