$\frac{x^3-y^3}{x-4}$
$25x^4+80x^2+64$
$12.48+\left(-10.636\right)$
$x^2+9x+4$
$2e^{cx^2+x}$
$\lim_{n\to\infty}\left(\frac{n\left(n+1\right)}{\left(n+2\right)\left(n+3\right)}\right)$
$x^2-x+2>0$
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