The value of cos^(3) ((pi)/(8)). cos((3p...

The value of `cos^(3) ((pi)/(8)). cos((3pi)/(8)) + sin^(3) ((pi)/(8)).sin ((3pi)/(8))` is

A

`(1)/(2 sqrt2)`

B

`(1)/(sqrt2)`

C

`(1)/(4)`

D

`(1)/(2)`

Verified by Experts

The correct Answer is:

A

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