$3n^2-3n-36$
$\frac{d}{dx}\left(xyz\cdot\ln\left(x+y+z\right)=3\right)$
$\frac{dy}{dx}=-\frac{y}{x}+\sqrt{y}$
$sec^2x\left(1-cosx\right)\left(1+cosx\right)$
$2\left(-3y\right)\left(xy\right)$
$-3x+6-3\left(x-2\right)$
$a^4-7a^2-30$
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