$\lim_{x\to4}\left(\frac{x^2-16}{3x^3+x-24}\right)$
$\frac{dy}{dx}\left(x^2+1\right)+xy=2x$
$9a^2-12a^2b+4a^29^2$
$\left(x^3+6x^2-3\right)\left(x+6\right)$
$a2+a-7+2a+5$
$\left(36+m\right)\left(6+m\right)$
$\cot^3\left(x\right)=\cot\left(x\right)$
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