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For 0 lt x lt pi the values of x which ...

For 0 `lt x lt pi` the values of x which satisfy the relation
`9^(1 + | cos x | + | cos^(2) x | + cos^(3) x | + …."upto" infty )= 3^(4)` are given by

A

`pi//3, 2pi//3`

B

`pi//3, 3 pi//4`

C

`pi//4, 3 pi//4`

D

none of these

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The correct Answer is:
A
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