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Let f(theta)=(1+cos theta)(1+cos theta) ...

Let `f(theta)=(1+cos theta)(1+cos theta) (1+cos 3 theta)(1+cos 5theta)(1+cos7theta)` then `f(-(pi)/(8))` is equal to:

A

`-1//8`

B

`1//4`

C

`-1//4`

D

`1//8`

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The correct Answer is:
d
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