" at: "cos6^(@)cos42^(@)cos66^(@)cos78^(...

" at: "cos6^(@)cos42^(@)cos66^(@)cos78^(@)=(1)/(16)

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

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

Prove that cos 20^(@)cos40^(@)cos60^(@)cos80^(@)=(1)/(16)

Prove that :cos20^(@)cos40^(@)cos60^(@)cos80^(@)=(1)/(16)

Prove that: cos36^(@)cos72^(@)cos108^(@)cos144^(@)=(1)/(16)

cos20^(@).cos40^(@).cos60^(@).cos80^(@)=1/16

cos20^(@).cos40^(@).cos60^(@).cos80^(@)=1/16

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

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