Let \( f: \mathbf{R} \rightarrow \mathbf{R} \) be defined by \( f(x...

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Let \( f: \mathbf{R} \rightarrow \mathbf{R} \) be defined by \( f(x)=\frac{1}{x} \forall x \in \mathbf{R} \). Then \( f \) is
(A) one-one
(B) onto
P
WW
(C) bijective
(D) fis not defined
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