$\left(\frac{2}{3}x^2y^3-6z^2\right)\left(\frac{2}{3}x^2y^3-6z\right)$
$e^{2x^3+4}$
$5-\left(-24\right)$
$x-4=19$
$\lim_{x\to0}\frac{x}{\sqrt{x+2}-\sqrt{2-x}}$
$1-x^2\le-3$
$\left(\frac{sin^2\left(x\right)}{1+cos\left(x\right)}\right)=1-cos\left(x\right)$
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