$\int\frac{8x+28}{x^2+6x+8}dx$
$\lim_{x\to0}\left(\cos\left(ax\right)-b\sin\left(bx\right)\right)$
$2+6c+5c+9$
$\frac{d}{dx}-18$
$2x^3+6x^2-x-5$
$\int\frac{x}{\sqrt{\left(9-x^4\right)}}dx$
$8x^2\:-\:128$
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