$\frac{1}{\left(9+x\right)^2}$
$1235.40-735.65$
$\left(x^3-8\right)x$
$\frac{2}{10}-\frac{1}{5}$
$\left(\frac{10x^{3}}{2}\right)^{-1}$
$\cos\left(x\right)+\cos\left(x+120\right)+\cos\left(x+240\right)$
$\frac{5x^2y^4-10x^3y^2-15x^4y}{-5xy}$
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