Which of the following funcitons is not ...

Which of the following funcitons is not injective ?

A

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

B

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

C

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

D

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

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The correct Answer is:

B, C

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