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" 19.Prove that "cos36^(@)cos72^(@)cos10...

" 19.Prove that "cos36^(@)cos72^(@)cos108^(@)cos144^(@)=(1)/(16)

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Prove that cos36^(@)cos72^(0)cos108^(0)cos144^(0)=(1)/(16)

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

Prove that (1)cos36^(@)cos72^(@)cos108^(@)cos144^(@)=(1)/(16)(2) Show that 4sin27^(@)=sqrt(5+sqrt(5))-sqrt(3-sqrt(5))

Prove that cos 36^(@) cos 72^(@) cos 108^(@) cos 144^(@)=1//16 .

Prove that cos 36^(@) cos 72^(@) cos 108^(@) cos 144^(@)=1//16 .

Prove that cos 36^(@) cos 72^(@) cos 108^(@) cos 144^(@)=1//16 .

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

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