$x^2-18x+9$
$x^3-1-x^5+x^2$
$-\arctan\left(\infty\right)$
$9y+27$
$\left(nm^3-3n\right)^3$
$\cot\left(2x\right)=0.25$
$\frac{-4}{\left(x+2\right)^2}$
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