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" 4."cos78^(@)cos42^(@)cos36^(@)=(1)/(8)...

" 4."cos78^(@)cos42^(@)cos36^(@)=(1)/(8)

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Prove that: cos78^(0)cos42^(0)cos36^(@)=(1)/(8)

cos36^(@)-cos72^(@)=

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

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

cos 12 ^(@) cos 24 ^(@) cos 36 ^(@) cos 48^(@) cos 72^(@) cos 84^(@) = (1)/(2 ^(6))

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

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

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