The value of cos20^@cos40^@cos60^@cos80^...

The value of `cos20^@cos40^@cos60^@cos80^@` is equal to

A

`1/16`

B

`3/16`

C

`sqrt3/16`

D

`sqrt3/32`

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Select the correct option from the given alternatives. The value of cos A cos(60^@ -A) cos (60^@ +A) is equal to

A

`1/2 cos 3A`

B

`cos 3A`

C

`1/4 cos 3A`

D

`4cos3A`

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