$3x\ge-\frac{2}{3}$
$9x^2-81=0$
$\left(x-1\right)\left(x+1\right)^3$
$z^2+2zc+c^2$
$\pi+1\frac{2}{3}$
$\frac{5m^7n^4}{3mn^3}2$
$\frac{sen\:\theta\:-cos\theta\:}{sen\:\:\theta\:}$
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