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Let f(x) = |x|-1|, then points where f(x...

Let `f(x) = |x|-1|,` then points where f(x), is not differentiable is/are :

A

0, +-1

B

-1

C

o

D

1

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A
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  4. Let f be twice differentiable function satisfying f(1) = 1, f(2) = 4, ...

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