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(1+cos.(pi)/(8))(1+cos.(3pi)/(8))(1+cos....

`(1+cos.(pi)/(8))(1+cos.(3pi)/(8))(1+cos.(5pi)/(8))(1+cos.(7pi)/(8))` is equal to

A

`1/2`

B

`1/2+(1)/(2sqrt2)`

C

`1/2-(1)/(2sqrt2)`

D

`1/8`

Text Solution

Verified by Experts

The correct Answer is:
D
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