$f\left(x\right)=x\left(2x^2-1\right)$
$169-1.96$
$9k-6n-6nm^4+9km^4$
$\left(\frac{2}{3}a-\frac{1}{5}\right)^2$
$\left(n+11\right)\left(n-11\right)$
$h+2h+7g+9+g$
$e^{-y}cos\left(x\right)+\frac{dy}{dx}sin^2\left(x\right)=0$
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