$16n^4+12n^2$
$\int_{-6}^{-3}\left(\left(-\frac{18}{x}\right)-\left(x^2+10x+27\right)\right)dx$
$\int_{x^2}^{2-x}\left(\pi\:x^2\right)dx$
$3x^2+7=5x$
$x+3<3x-7$
$i ( 2 + i )$
$\frac{2x^2-5x+2}{2x-1}$
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