`" cos x + cos " (120^(@) -x ) + " cos "(120^(@) +x)=0`

cos A + cos (120 ^(@) - A ) + cos (120 ^(@) + A ) =0

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

Prove the following : cos A + cos (120^@ - A) + cos (120^@+ A) = 0 .

cos (120^(@)) is -

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

Prove that, cos alpha + cos(120^(@) + alpha) + cos (120^(@) - alpha) = 0

Statement - I : Period of cos^(3) x + cos^(3) (120^(0) - x) + cos^(3) (120^(0) + x ) is (pi)/(3) Statement -II : Period of cos((2pi x)/ 3 ) + sin((pix)/2) - tan ((pi x )/ 4) is 12 Which of the above statement is correct.

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