Which of these functions is not a self-inverse function, i.e., \( f^{-1}(x)=f(x) \) ?
(a) \( f(x... VIDEO
Which of these functions is not a self-inverse function, i.e., \( f^{-1}(x)=f(x) \) ?
(a) \( f(x)=2 x \)
(b) \( f(x)=x \)
(c) \( f(x)=-x \)
(d) \( f(x)=\frac{2}{x} \)
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