$\frac{x^2+x}{1-2x}$
$4n^2\cdot6n^3$
$2x^2+6+14x^2-9-5x$
$\lim_{x\to0}\left(\frac{4x^2-5x}{1-3x^2}\right)$
$\left(-2\right)\cdot\left(-3\right)\cdot\left(-1\right)\cdot\left(-4\right)\cdot\left(-2\right)$
$20abc+15a^2c^2-ac$
$\frac{dy}{dx}sent=ylny$
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