If \(A\) and \(B\) are the domain and range of the real valued function, \[ f(x)=\dfrac{|x|}{\sqrt{1-|x|}} \] then \(A \cup B =\ ?\)
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For functions containing square roots in the denominator, always use the condition
\[
\text{Radicand}>0
\]
instead of merely \(\ge0\). This helps determine the exact domain correctly.