$3n^2-n-2$
$2m+3m^2-4m$
$-4.9^2+8.05+4$
$\frac{2x^2-6x+5}{x+2}$
$\int3z\cdot\cos\left(-z\right)dx$
$\lim_{x\to0}\:\frac{x}{\sqrt{2+x}-\sqrt{2}}$
$\left(x-2y\right)\frac{dy}{dx}+2x+y=0$
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