$2x+\frac{1}{3}\ge2$
$\frac{5x^{-1}y^{-2}}{x-2y-4}$
$\frac{2}{3\sqrt{a+9}}$
$\frac{\cos\left(2x\right)-\cos\left(4x\right)}{\sin\left(2x\right)+\sin\left(4x\right)}$
$\left(-3x-2\right)\left(3x+2\right)$
$x^2\cdot x^2+x$
$\cos^2\left(x\right)+\cos\left(x\right)=2$
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