$4x^2-24x-28$
$\left(2^{-4}\right)^{-3}\left(2^2\right)$
$\ln\left(6-3x^2\right)$
$\sen^{4}\theta-\cos^{4}\theta=\sen^{2}\theta-\cos^{2}\theta$
$\left(3\right)\left(25x^2\right)\left(1\right)$
$4\cdot10^{-6}+2\cdot10^3$
$\left(yz+z-3\right)\left(yz+z-3\right)$
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