Prove that : `cos 36^@ cos 72^@ cos 108^@ cos 144^@ = 1/16`

cos 36^@ - cos72^@ =

Prove that : sin 36^@ sin 72^@ sin 108^@ sin 144^@ =5/16 .

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

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

Prove the following : 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))

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

Prove that cos 20^@ cos 40^@ cos 60^@ cos 80^@=1/16 .

Prove that cos 20^@ cos 40^@ cos 60^@ cos 80^@=1/16 .