$3x\:>\:18\:$
$\int_2^{\infty}\left(\frac{1}{\sqrt{x^4-1}}\right)dx$
$-\frac{1}{2\:}\left(-\frac{3}{2}x\:+6x\:+1\right)\:-3x$
$x^4-20x^2+64$
$\left(x^2y^2z^2-xyz\right)^2$
$\left(\sqrt{\left(n+1\right)}-\sqrt{n}\right)\sqrt{n^2+n}$
$\left(6-2x\right)\left(6-2x\right)$
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