$\sqrt{4}.\sqrt{5}.\sqrt{1}$
$\left(2x^5+4-\frac{2}{x^5}\right)\left(4x^4-5\right)$
$4sen2xcos2x$
$\frac{-x^2-2x+1}{x+1}$
$3\:x\:5\:x\:4\:$
$9m^6-36n^3$
$\left(-5\right)+\left(-2\right)-\left(+1\right)+\left(+4\right)-\left(+6\right)$
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