$\lim_{x\to\infty}\:\frac{\left(x^4+x-6\right)}{\left(x^2-4\right)}$
$13nx^2-30nx^2$
$-1\:+\:5\:+\:-1$
$x^{2}-9=72$
$\left(7m^6+6\right)\left(7m^6-6\right)$
$\left(x^2-2x+4\right)\left(x^4-2x^2+4\right)$
$\lim_{n\to\infty}\left(\frac{2}{n+1}\right)$
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