$^{x^n}^{y^m}$
$\sqrt{20x^{10}z^{11}}$
$\tan y+\cot y=\sec y\cdot\csc y$
$\frac{8a^5b^6}{24a^3b^2}$
$-x\:+\:-y\:+\:7x\:-\:4y\:+\:13\:-\:99$
$-4x=-20$
$\frac{x^2-x-6}{x+1}$
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