$\lim_{x\to0}\left(-\frac{81\cos\left(9x-1\right)}{2}\right)$
$a-b+c-8a-c-10+b-7b-9+21a-d+50$
$-20x^2+600x-4000$
$\int x\sec^2\:3xdx$
$x^24x+6$
$\int\left(\frac{\left(x+ln\left(x\right)\right)}{x}\right)dx$
$\frac{\left(-2x^5+6x^3+14\right)}{x-2}$
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