$-58\:-\:\left\{-72\right\}$
$\cos\left(\frac{2\pi}{3}\right)\cos\left(\frac{\pi}{5}\right)+\sin\left(\frac{2\pi}{3}\right)\sin\left(\frac{\pi}{5}\right)$
$\sqrt{x^2+6x}=4$
$a.\sqrt{512.b}$
$\frac{x^{4}-6x^{3}+8x^{2}-3x+12}{x-4}$
$6=4+\frac{u}{2.56}$
$2\left(-5\right)^2$
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