$\lim_{x\to1}\left(\frac{x^3-x^2-x+1}{\sin\left(\pi x\right)^2}\right)$
$-\:6m\:+\:8n\:+\:5\:-\:m\:-\:n\:-\:6m\:-\:11$
$\left(14-y-z\right)^2$
$s^{-4}\cdot s^2$
$\frac{15x^2-19x+12}{5x-3}$
$\cos\left(x\right)\left(\:\cos\left(2x\right)-2\sin\left(x\right)^2\right)$
$\left(-x\:+\:5\right)^2$
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