$-\sqrt{-25}$
$\left(2-\frac{a}{8}\right)^2$
$4\:in\:x-\frac{1}{3}in\:y$
$x^2-21x+20<0$
$9-\left(-19\right)$
$0,356\cdot3,7$
$\lim_{x\to\infty}\left(\frac{1-\cos\left(x\right)}{2\:-\:2e^{4x}}\right)$
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