$\lim_{x\to\infty}\left(\frac{x^2+1}{x}-\frac{1}{1-\frac{x}{x-1}}\right)$
$\lim_{x\to\infty}\left(\frac{x}{x+15}\right)$
$x^2-3x=-40$
$3x^2+5x+20x^2$
$m^8+18^4+81$
$\int\frac{1}{x-2\left(x+1\right)}dx$
$\int\frac{5}{x^2-3x-4}\:dx$
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