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cos20^(0)cos40^(0)cos60^(0)cos80^(0) is ...

`cos20^(0)cos40^(0)cos60^(0)cos80^(0)` is equal to

A

`(1)/(2)`

B

`(1)/(8)`

C

`(1)/(16)`

D

`(1)/(2sqrt2)`

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