8cos10^(@)*cos20^(@)*cos40^(@)" What is the value of ? "

If x=cos10^(@)cos20^(@)cos40^(@), then the value of x is

If x= cos 10^(@)cos 20^(@) cos 40^(@), then the value of x is

If x= cos 10^(@)cos 20^(@) cos 40^(@), then the value of x is.............. A) 1/4 tan 10^(@) B) 1/8 cos 10^(@) C) 1/8 cosec 10^(@) D) 1/8 sec 10^(@)

If x=cos10^(@)cos20^(@)cos40^(@) , then x = ?

cos 20^(@) cos 40^(@) cos 80^(@)=

If x=cos10^@cos20^@cos40^@ , then the value of x is

If x=cos 10^@ cos20^@ cos40^@ , then the value of x is

8 cos^(3) 20^(@) -6 cos 20^(@) =

cos20 ^ (@) cos40 ^ (@) cos80 ^ (@) =