Write the domain of the real function `f(x)=1/(sqrt(|x|-x))`

Explanation

The function `f(x)=frac{1}{sqrt{|x|-x}}` is defined only when `|x|-x>0` `|x|>x`



`frac{{x}}{|{x}|}<1`



This is possible only when `x in(-infty, 0)`