$3+x+y+7$
$\left(x-9\right)=x^2-81$
$\frac{\csc\left(x\right)}{1+\cot\left(x\right)^2}$
$\frac{x^{10}}{x^{12}}$
$2x^3\sqrt{\frac{1}{4x^2}}$
$\left(2\right)^6-64$
$\left(8u-v\right)^2$
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