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Mathematics
Problem
Suppose
f
f
f
is continuous at
x
=
5
x=5
x
=
5
but its derivative
f
′
f'
f
′
has a jump discontinuity at
x
=
5
x=5
x
=
5
. In one sentence, explain why
f
f
f
is not differentiable at
x
=
5
x=5
x
=
5
.
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