$x\left(\sqrt{x^2+1}-x\right)$
$67,5-60$
$6xy+4x^2y^3z+10z^2y^3x^4$
$x^3\:y'\:+\:4\:x^2\:y\:=\:e^{-3}\:$
$81-c^2$
$4-9n^2$
$\sqrt{4x^2y^3}$
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