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" 15."cos36^(@)*cos72^(@)*cos108^(@)*cos...

" 15."cos36^(@)*cos72^(@)*cos108^(@)*cos144^(@)=?

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

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

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

Prove that: cos36^(@)cos72^(@)cos108^(@)cos144^(@)=(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 cos 36^(@) cos 72^(@) cos 108^(@) cos 144^(@)=1//16 .

A=cos20^(@)cos40^(@)cos60^(@)cos80^(@),B=cos60cos42^(@)cos66^(@)cos78^(@) and C=cos36^(@)cos72^(@)cos108^(@)cos144^(@) then