$\int\left(2x+4\right)\left(e^{2x+4}\right)dx$
$\frac{\cot^2x-1}{2\cot x}$
$\frac{1}{81}\:a^2+16+\frac{8}{9}a$
$2\left(20\right)^3+3\left(20\right)^2+20$
$-x^2+6x+1$
$\lim_{x\to2}\left(\frac{4x^2+18x}{x+2}\right)$
$\frac{2x^4-x^3+7x-3}{x^2+2}$
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