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

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 = ?

cos20^@cos40^@cos80^@=

If cos(40^@ +x) =sin30^@ then the value of x is ___

if ( cos ^(3) 20^@ + cos^(3) 40^(@))/( cos 20^@+ cos 40^(@)) = k ,then the value of k is

If (cos^(3)20^(0)+cos^(3)40^(0))/(cos20^(0)+cos40^(0))=k , then the value of k is

If e^(cos x) -e^(-cos x) = 4 , then the value of cos x, is