$\left(x-y\right)+\left(2x+3y\right)$
$\left(-k-3\right)^2$
$9y^2-x^2y^2$
$3\left(x^3-729\right)$
$\frac{d}{dx}\left(\left(3x-4\right)^2\left(2x^2+6\right)^5\right)$
$\frac{1+tan\theta\:}{1-tan\theta\:}$
$5x^2+32x+12$
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