cos20*cos40^(@)cos60*cos80

Prove that cos20^0cos40^0cos60^0cos80^0=1/(16)dot

Prove that: cos20^0cos40^0cos60^0cos80^0=1/(16)

Prove that cos20^0cos40^0cos60^0cos80^0=1/(16)dot

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

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

A=cos 20^(@)cos 40^(@) cos60^(@)cos 80^(@) , B=cos6^(@)cos42^(@)cos66^(@)cos78^(@) and C=cos 36^(@)cos72^(@)cos 108^(@)cos 144^(@) then

cos20^(0)cos40^(0)cos60^(0)cos80^(0) is equal to

cos20^@cos40^@cos80^@=

Prove that cos20^(@) cos40^(@) cos80^(@) = 1/8