$cot^210$
$\left(x+6\right)\left(x+3\right)\left(x-6\right)$
$\int\left(\frac{x^4-5x^2+8}{\sqrt{x}}\right)dx$
$x-0$
$\int\frac{9x}{x^2+6}dx$
$49r^2+14r+4$
$\frac{x^2}{x^2+3}$
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