$4^2+9x+81$
$y^2\:-\:\left(x^2\:-1\right)$
$17sin\left(x\right)+17=0$
$-3-\left(-18\right)$
$3\sqrt{2}\cdot\left(x-\sqrt{2}\right)$
$\lim_{x\to\infty}\left(\frac{x+1}{x^4+2x+2}\right)$
$\frac{\frac{1}{2}a^2}{5a^3}$
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