$4x\left(m-n\right)+n-m$
$9x^2-4c-5c-4x^2$
$\lim_{x\to0}\left(\frac{5-\cos\left(x\right)}{9x^2}\right)$
$\frac{5x^2+23x+16}{x+4}$
$\frac{\sin\left(a\right)}{\cos\left(a\right)}-2=1$
$-5h^2\:+\:4h^2\:+\:4h^2$
$\int4sin^4\left(x\right)cos\left(x\right)dx$
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