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The smallest interval [a,b] such that ...

The smallest interval [a,b] such that
`int_0^(1) (1)/(sqrt(1+x^(4)))dx in [a,b]`, is

A

`[(1)/(sqrt(2)),1]`

B

[0,1]

C

`[(1)/(2),1]`

D

`[(3)/(4),1]`

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The correct Answer is:
A
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The smallest integral [a,b] such that int_(0)^(1) (1)sqrt(1+x^(4))dx in [a,b] is given by

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