$\frac{6x^2y^{-3}}{2x^{-4}y^{-5}}$
$x^2y^5z^2-x^6z+x^3y^4z^2-z^7$
$6x^{11}+66x^9-12x^8-24x^5$
$\sin^2x\cdot\csc^2x-1$
$-2\left(a\:-\:2b\right)\:$
$4xy2\:-\:24xy\:+\:62$
$3+\left(f+8\right)$
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