$\cos\left(x\right)=\frac{-\sqrt[2]{3}}{2}$
$4a^2-12a^2b^2+9a^2b^2$
$\left(6x\right)-\left(4x+1\right)$
$8r-2\left(7r+9\right)$
$14+3y+7-3x$
$12-\left[8-2-\left(5-7\right)-3+0\right]-2$
$y=c\:x^{-1}$
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