int(0)^(pi//4) sec^(4) x" dx =...

`int_(0)^(pi//4) sec^(4) x" dx = `

A

`(2+ sqrt(2))/3`

B

`(2-sqrt(2))/3`

C

`(2+2sqrt(2))/3`

D

`(2-2sqrt(2))/3`

Verified by Experts

The correct Answer is:

B

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