$cos\left(-u\right)$
$2+3\:x\:2$
$\frac{3}{4}\left(x-2\right)+\frac{1}{2}\left[\frac{x}{2}-\frac{x}{3}+\frac{1}{2}\right]$
$\int\left(2x^2+3x-2\left(4x+3\right)\right)dx$
$\lim_{x\to\infty}\left(\frac{x^3+4-9x}{2x^3-7x^5-2x}\right)$
$15+12x-5x+4y-7$
$\left(xy^3+1\right)dx=x^2y^2dy$
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