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The critical point of : f(x) = 1 + x +...

The critical point of :
`f(x) = 1 + x + int_1^x [(log t)^2 + 2 log t] dt` is :

A

`1/e`

B

`pi/2`

C

`pi/3`

D

`pi/6`

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The correct Answer is:
A
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