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Which of the following functions is not ...

Which of the following functions is not injective ?

A

`f(x) = |x + 1|, `x in [-1, 0)`

B

`f(x) = x + 1/x, x in [0, infty)`

C

`f(x) = x^2+ 4x - 5`

D

`f(x) = e^(-x), x in [0, infty)`

Text Solution

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The correct Answer is:
B, C
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