$a+b-c-b-c+2c-9$
$2x^2-12x-3=0$
$\:\sec\theta\:-\:\sec\theta\sin^2\theta$
$c^2-11c+24$
$\left(x^2+xy+y^2\right)\left(a-b\right)$
$\lim_{x\to0}\left(\frac{2x^2}{x^2+4}\right)$
$\frac{d^4}{dx^4}\left(x^4\right)$
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