$3x^2+9x+12+36$
$x^2-48x+16$
$cos8x-cos4x$
$\int6x^{-2}dx$
$2x^2+16x=0$
$\lim_{x\to-\infty}\left(4xsin\left(\frac{1}{x}\right)\right)$
$9\:-\:9\:x\:2$
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