$25n^2-36$
$\left(5x^4-3x^2+x-1\right):\left(x^3-x-1\right)$
$\lim_{x\to0}\left(\frac{x}{1+x}\right)$
$2004\cdot2002$
$\frac{340}{4}$
$\frac{n}{-2}>4$
$\int_0^{\infty}\left(\frac{x^2-1}{1+x^2}\right)dx$
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