$4yx^2-4y^2x$
$-3\left(\frac{3x}{2}\right)\left(-\frac{xy}{2}\right)^2$
$3x^2-22x-1$
$\int\left(x-2\right)senx\:dx$
$\left(y+12^2\right)$
$\left(82-x\right)^2$
$\lim_{x\to0}\left(\frac{n^3-1}{n^4+3}\right)$
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