$x\:x\:2x+4$
$2x+4>2$
$\sqrt{\frac{u-1}{u+1}}$
$\left(\sqrt{x^6+1}+1\right)\left(\sqrt{x^6+1}-1\right)$
$\left(-3a-4\right)^3$
$5x^2+12x$
$-33m^4+44m^3-11m^2$
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