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Question

Let f(x)=x0|x1|dx,x0.Thenf(x)is

A
continous at x=1
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B
continous at x=2
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C
differentiable at x=1
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D
differentiable at x=2
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Solution

The correct options are
A continous at x=1
B differentiable at x=2
C continous at x=2
f(x)=x0|x1|dx
Using leibnitz theorem
f(x)=1.|x1|0=|x1|
Therefore for x=1 f(x) is continuous, but not differentiable as moduls function is not differentiable at its critical point.
And for x=2, f(x) is continuous and differentiable

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