$\frac{81x^57y^412z^2}{9x^54y^36z^2}$
$\frac{x^2-25}{x^2-10x+25}$
$\left(e^x+e^x\right)^{\frac{1}{2}}$
$4n^2-8n+2$
$-2\sec\left(x\right)+6=-10\sec\left(x\right)-10$
$\left(-1576\right)\left(-17\right)$
$\left(\:10m\:-\:9\right)\left(\:10m\:+\:9\:\right)\:$
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