Find the value of `cos^(2)x+cos^(2)(x+(pi)/(3))+cos^(2)(x-(pi)/(3))`

Prove that cos^(2)x+cos^(2)(x+(pi)/(3))+cos^(2)(x-(pi)/(3))=(3)/(2)

Prove that cos^(2)x+cos^(2)(x+(pi)/(3))+cos^(2)(x-(pi)/(3))=(3)/(2)

Find the value of 2cos^(3)((pi)/(7))-cos^(2)((pi)/(7))-cos((pi)/(7))

The greatest value of cos^(2)((pi)/(3)-x)-cos^(2)((pi)/(3)+x) is

The maximum value of cos^(2)((pi)/(3)-x)-cos^(2)((pi)/(3)+x), is

If sin^(-1)x+sin^(-1)y=(2 pi)/(3) ,then the value of cos^(-1)x+cos^(-1)y is (A) (2 pi)/(3) (B) (pi)/(3) (C) (pi)/(2) (D) pi

The value of cos^(2)x + cos^(2) (pi/3 + x) - cos x *cos(pi/3+ x) is

The range of cos^(2)(2(pi)/(3)-x)+cos^(2)(2(pi)/(3)+x) is

Find the sum of maximum and minimum values of cos x cos((2 pi)/(3)+x)cos((2 pi)/(3)-x)

Find the value of cos^2. pi/16+cos^2. (3pi)/16+cos^2. (7pi)/16 .