$x^2-12x+-24$
$e^4-8=x$
$c^2-8c+12$
$x=2\:\:,\:\:y=-3$
$\frac{z^2}{\left(2-z\right)}$
$\frac{cot\left(x\right)+\sec^2\left(x\right)}{\csc^2\left(x\right)}$
$4a^2-16ab-16b^2$
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