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Mathematics
Problem
Let
f
(
x
)
=
∣
∣
x
∣
−
1
∣
f(x) = ||x| - 1|
f
(
x
)
=
∣∣
x
∣
−
1∣
, then points where,
f
(
x
)
f(x)
f
(
x
)
is not differentiable is/are a. 0,
±
1
\pm 1
±
1
b.
±
1
\pm 1
±
1
c. 0 d. 1
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