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If theta=pi//8, and f(theta)=cos^(6)thet...

If `theta=pi//8, and f(theta)=cos^(6)theta+cos^(6)3theta+cos^(6) 5 theta +cos^(6)7theta` then `f(theta)` is equal to:

A

`3//4`

B

1

C

`5//4`

D

`3//2`

Text Solution

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The correct Answer is:
c
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