$\cot\left(a\right)+1=0$
$\frac{a^3-27b^3}{3a+9ab}$
$\left(4t-3\right)^3$
$1-2\cos\left(x\right)\sin\left(x\right)=2\sin^2x-1$
$\frac{d}{dx}\:\sqrt{3}$
$\frac{dy}{dx}=\frac{y}{x}+6x+5$
$\left(2r+5\right)\left(5-2y\right)$
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