$\lim_{x\to0}\left(\frac{1-\cos\left(7x\right)}{sin\left(4x\right)}\right)$
$5a-a^2b-10+2ab$
$\left(6c+4\right)+\left(2c+3\right)$
$4b\cdot11n^2$
$f\left(x\right)=\frac{x^{2}-x-2}{x-2}$
$144x^6\:y^2+240x^3\:yz^2+100z^4$
$\frac{9m^2n}{-4mn^2}$
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