$-1\le2-3x$
$\sqrt{\left(x+y\right)}^2-x^2-6x$
$\int\sqrt{x^2+4}x^{-2}dx$
$\lim_{x\to\infty}\left(\frac{16x^2-6x-5}{8x^2-5x+4}\right)$
$\left(x^2-3x+1\right)\left(x^2-1\right)$
$\sqrt{\frac{a^3}{b^3}+\frac{b^3}{a^3}+3m}$
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