$\frac{dy}{dx}\cos\left(y\right)+\cos\left(x\right)$
$14a-21xy+35$
$\frac{4y-2y}{2xy}$
$-35m^2n^3-70m^3$
$\lim_{x\to-1}\left(\frac{x^2+5x-14}{x^2-4}\right)$
$\left(5x+3y+z\right)^2$
$258-3.7$
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