4\ cos 6^@ cos 42^@ cos 60^@ cos 78^@=...

`4\ cos 6^@ cos 42^@ cos 60^@ cos 78^@=`

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Prove that cos 6^(@) cos 42^(@) cos 66^(@) cos 78^(@) =(1)/(16)

Prove that 4 cos 6^(@) cos 42 ^(@) cos 66^(@) cos 78^(@) = (1)/(4).

Prove that 4 cos 6^(@) cos 42 ^(@) cos 66^(@) cos 78^(@) = (1)/(4).

Prove that cos6^@ . cos42^@. cos66^@ cos78^@= 1/16

4cos6^(@)cos42^(@)cos60^(@)cos78^(@)=

cos6^(@) cos42^(@) cos66^(@) cos78^(@) =

The value of cos 20^(@) cos 40^(@)cos 60^(@) cos 80^(@) is equal to

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