Which of the following functions cannot have their inverse defined ? (where $[.]\, \to$ greatest integer function)
Which of the following functions cannot have their inverse defined ? (where $[.]\, \to$ greatest integer function)
- A
$f : R \to R^+ ; y = e^x$
- B
$f : R^+ \to R ; y = log|x|$
- C
$f:\left[ { - \frac{\pi }{2},\frac{\pi }{2}} \right] \to [-1, 1]; y = sin^3x$
- D
$f : R \to R^+ ; y = e^{[x]}$
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