Which of the following function is inverse function
Which of the following function is inverse function
- A
$f(x) = \frac{1}{{x - 1}}$
- B
$f(x) = {x^2}$ for all$x$
- C
$f(x) = {x^2}$, $x \ge 0$
- D
$f(x) = {x^2},\;x \le 0$
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