(Solved): If the function \( f: \mathbb{R} \backslash\{2\} \rightarrow \mathbb{R} \backslash\{2\} \) defined ...

If the function \( f: \mathbb{R} \backslash\{2\} \rightarrow \mathbb{R} \backslash\{2\} \) defined by \( f(x)=\frac{2 x-1}{x-2} \), then the composite function \( f \circ f(x)= \). a) \( -\frac{1}{x} \) b) \( x \) c) \( -x \) d) \( \frac{1}{x} \)