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6*cos6^(@)cos42^(@)cos66^(@)cos78^(@)=(1...

6*cos6^(@)cos42^(@)cos66^(@)cos78^(@)=(1)/(16)

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Prove that cos6^(@)*cos42^(@)*cos66^(@)cos78^(@)=(1)/(16)

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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).

A=cos 20^(@)cos 40^(@) cos60^(@)cos 80^(@) , B=cos6^(@)cos42^(@)cos66^(@)cos78^(@) and C=cos 36^(@)cos72^(@)cos 108^(@)cos 144^(@) then

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cos42^(@)+cos78^(@)+cos162^(@)=