$\lim_{x\to\:0}\left(x-5\right)sec\left(x\right)$
$-\frac{2}{3}-\frac{1}{3}$
$-\frac{525}{21}$
$\lim_{x\to4}\left(\frac{x^2+5x+4}{x^2-2x-8}\right)$
$-2\left(6n-9\right)+2$
$\left(a+m\right)\left(a-m\right)$
$\lim_{x\to\infty}\left(\frac{\ln\left(x^5\right)}{x}\right)$
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