$\left(-2m-x\right)^2$
$\sqrt[5]{-243m^5n^{15}}$
$5x^2-12x+7$
$\frac{1+\sec\left(t\right)}{1-\sec\left(t\right)}$
$13x-8x+10y-15y$
$\left(x^3\:+\:7\right)\:\left(x^5\:-\:2x^4\:+\:5x^3\:+\:x^2\:-\:3x\:+\:1\right)\:$
$\left(y^2-3\right)^2$
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