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Mathematics
Problem
9. Prove that the function
f
f
f
given by
f
(
x
)
=
∣
x
−
1
∣
,
x
∈
R
f(x)=|x-1|, x \in \mathbf{R}
f
(
x
)
=
∣
x
−
1∣
,
x
∈
R
is not differentiable at
x
=
1
x=1
x
=
1
.
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