$2+5\left(x+3\right)-\:\left(2x-7\right)\left(x+2\right)$
$3x^{6}+3x^{12}-4x^{6}y^{6}$
$\cot\left(x\right)\cos\left(x\right)=\csc\left(x\right)$
$x^2-\frac{2}{3}x=0$
$xy=k^2$
$\frac{dy}{dx}=\frac{-y}{2y-x}$
$0.5^2$
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