$\left(\frac{4m^5n^2}{m^2n}\right)^3$
$3^1.-3^{-1}$
$\left(-5\right)+\left(-9\right)-\left(+5\right)-\left(-10\right)$
$\frac{\left(x-2\right)\left(x^2+2x+4\right)}{x+2}$
$\left(\frac{x}{3}-4\right)\left(\frac{x}{3}+4\right)$
$\frac{1}{\pi}\int_0^{\pi}2dx$
$4x^4-9x^2$
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