$-3a=15$
$\left(x^2\:-\:z^2\right)^3$
$\left(\frac{1}{4}m^2n-\frac{1}{3}mp\right)^2$
$\left(\ln\left(xyz\right)+xye^z-xyz\right)$
$y'+\frac{y}{x}=xy^2$
$\lim_{x\to-2}\left(\frac{x^{2}-1}{x+2}\right)$
$\frac{d}{dx}\sec8$
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