$\frac{1}{s^2+2s+1}$
$0.25x^2-0.3xy+0.09y^2$
$3x\left(1+2x+3x^2\right)$
$121y^2+22yz+z^2$
$\left(4x-c^5\right)^3$
$22.89-48.4$
$\lim_{x\to\infty}\left(\frac{1}{4-x^2}\right)$
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