The domain of the function \( f(x)=\sqrt{x^{2}-[x]^{2}} \), where \...

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The domain of the function \( f(x)=\sqrt{x^{2}-[x]^{2}} \), where \( [x]= \) the greatest integerless than or equal to \( x \), is
\( \mathrm{P} \)
W
(a) \( R \)
(b) \( [0,+\infty) \)
(c) \( (-\infty, 0] \)
(d) none of these
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