$x2-9x-20$
$16x^2+192x+576$
$\tan\left(x\right)^2\left(\sin\left(x\right)+\cos\left(x\right)\right)$
$\frac{x^2-3x^2}{x^2-9}$
$-\:5\:m\:+\:6\:n\:+\:7\:m\:-\:2n\:-\:m\:$
$-36\cdot4$
$-12+5\left(-1+4\right)+\left(-7\right)$
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