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

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

A

`-1`

B

0

C

2

D

1

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The correct Answer is:
C
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