$\lim_{x\to0}\left(\frac{\cot\left(4x\right)}{cot\left(3x\right)}\right)$
$\sin\left(\left(2x-3\right)^2\right)$
$40x+40=40x+20$
$\int\frac{9x^3}{\sqrt{4+4x^2}}dx$
$\left(m-12\right)\left(m-7\right)$
$\left(12+7x\right)\left(5+7x\right)$
$45-5x^2$
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