" The value of "cos^(3)theta+cos^(3)(120^(@)+theta)+cos^(3)(theta-120^(@))|" is "

The value of cos ^(3) theta + cos ^(3) (theta +120^(@)) + cos ^(3) (theta- 120^(@)) is

cos^(3) theta + cos^(3) ( 120^(@) +theta ) + cos^(3) (120^(@) - theta )=

The value of cos ^(3) theta + cos ^(3) (theta +120^(@)) + cos ^(3) (120- theta^(@)) is

The value of cos^3theta+cos^3(theta+120^@)+cos^3(theta-120^@) is

The value of the expression cos^(3)theta+cos^(3)(120+theta)+cos^(3)(240+theta) is

Prove that cos theta + cos (120^(@) + theta) + cos ( 120^(@)-theta) =0. Hence deduce that cos ^(3) theta + cos ^(3) ( 120^(@) + theta ) + cos^3( 120^(@)-theta) = 3/4 cos 3 theta.

The value of the expression cos^3theta+cos^3(120+theta)+cos^3(240+theta) is;

cos theta + cos (120^(@) + theta ) + cos (120^(@) - theta )=

cos^2theta+cos^2(120^@+theta)+cos^2(120^@-theta)=.....