$\sqrt[4]{x^2-3}=-2$
$\frac{1}{x-1}>1$
$0,52+0,27$
$a+a+a+a$
$\left(x+y\right)dx+xdy=0\:$
$\lim_{x\to0}\left(\frac{1-\cos\left(7x\right)}{7x^3}\right)$
$\int x^3\cdot sqrt\left(25-x^2\right)\:$
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