$\int_0^1\left(\frac{x^2+x}{x^2+x+1}\right)dx$
$-5312+-9960$
$\frac{x^3-3x^3-2x+1}{x-2}$
$x^2-18x+55=0$
$9f\:+7f-f$
$9x^2+10x+225$
$\lim_{x\to\infty}x\sin\left(\frac{6\pi}{x}\right)$
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