The function f(x) = (x^(2)-1)|x^(2) -3x+...

The function `f(x) = (x^(2)-1)|x^(2) -3x+2| + cos(|x|)` is not differentiable at

A

`-1`

B

0

C

`1`

D

2

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The correct Answer is:

D

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