$\left(1+2a\right)^5$
$x^2+5x+72$
$\left(\frac{x^6}{x^5}\right)^{-2}$
$3a+5\:para\:a=-2$
$5x-2^2$
$y^2=-20$
$\lim_{x\to-2}\left(\frac{\left(x-2\right)^2}{x^4-16}\right)$
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