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Q 2539591412.     Find the value of the expression `cos^4 pi/8 + cos^4 (3 pi)/8 + cos^4 (5 pi)/8 + cos^4 (7 pi)/8`.

BCECE 2015 Mains
A

`2/3`

B

`- 3/2`

C

`3/2`

D

`- 2/3`

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