$\lim_{x\to4}\left(\frac{x^2+5x+4}{x^2-2x-8}\right)$
$4^{-2}\cdot4^3$
$\int-3^x\:dx$
$\frac{5^{-12}}{5^{-12}}$
$-9x^2+2x+4$
$.5^2$
$x^3-2x^2+5x-8\:para\:x=-2$
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