$\frac{x^2+1}{\left(x+1\right)\left(x-2\right)\left(x-3\right)}$
$4x^2-x^2+6x$
$\frac{16.2}{1000}$
$\lim_{x\to1}\left(\frac{x-1}{2+\sqrt{x+3}}\right)$
$\left(2a\right)\left(a^2b\right)$
$\lim_{x\to0}\left(\frac{x^3+x^2-x-15}{2x^2-3}\right)$
$x^2+9\ge0$
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