$-\frac{x-2}{x+8}$
$\lim_{x\to0}\frac{12.5^x-1}{x}$
$\frac{\left(x^4-x^3-3x^2+x+2\right)}{\left(x^2-x-2\right)}$
$-21-\left(-7\right)$
$sen2\:+\:sen2\:tan2\:=\:tan2$
$\lim_{x\to4}\left(\sqrt{x^2-1}\right)$
$\frac{s^3+4^2+6s+4}{s+1}$
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