$\frac { 8 } { 1 x ^ { 3 } - 4 x ^ { 4 } }$
$\frac{21mn^3x^6}{28m^4n^2x^2}$
$6\cot\left(x\right)-6\cot\left(x\right)\cos^2\left(x\right)=3\sin\left(2x\right)$
$\left(2x-8\right)^5$
$-xy-3xy-2xy-3$
$9\left(a+9\right)^2-6\left(a+9\right)+1$
$81-25x^2y^2$
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