$\left(-24\right)-\left(-17\right)$
$\frac{x^9}{x^5}$
$-3\left(x^3-6x^2-x+30\right)$
$\left(\frac{1}{2a}-\frac{2}{3b}\right)\left(\frac{1}{2a}+\frac{2}{3b}\right)$
$5\left(x-4\right)+\left(x+4\right)\left(x-4\right)-\left(x-4\right)^2$
$\frac{\cot\left(\infty\right)}{\tan\left(\infty\right)}=\cot^2\left(\infty\right)$
$\int\:\frac{12}{1+9x^2}dx$
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