The period of `cos x cos(120^(@)-x)cos(120^(@)+x)` is

The period of | cos x| , is

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

cos120^o=

Find the period of f(x)=cos^(-1)(cos x)

The period of sin(pi/4)x+cos(pi/2)x+cos(pi/3)x is

The period of f(x)=tan 3x+ cos""(5x)/(2) ,is

Find the value of (a) cos 120^(@) (b) sin 240^(@) (c) tan (-60^(@)) (d) cot 300^(@) (e) tan 330^(@) (f) cos (-60)^(@) (g) sin (-150)^(@) (h) cos ( -120)^(@)

The period of the function |sin^3(x/2)|+|cos^5(x/5)| is

find the period of sin (x/2)-cos(x/3) 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.