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cos 20^(circ) cos 40^(circ) cos 60^(circ...

`cos 20^(circ) cos 40^(circ) cos 60^(circ) cos 80^(circ)=`

A

`(1)/(8)`

B

`(1)/(64)`

C

`(1)/(16)`

D

`(1)/(32)`

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