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Let f(theta)=cos theta cos 2 theta cos 4...

Let `f(theta)=cos theta cos 2 theta cos 4 theta cos 7 theta`, then `f(pi//15)` is equal to:

A

`1//4`

B

`1//8`

C

`1//16`

D

`1//32`

Text Solution

Verified by Experts

The correct Answer is:
c
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