$\lim_{x\to\infty}\left(\sqrt{x^2+17x}-x\right)$
$r^2-9t^2$
$\int\frac{2\cos t}{\sin^{2}t}dt$
$3+5+6+3+1$
$\left(2x^5+1\right)^4$
$ab-ac^2$
$\frac{x^5+12}{x^2+x+2}$
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