The value of cos-1(1/2) + 2sin-1(1/2) is equal to-

-2π/3 2π/3 -π/3 π/3

2π/3

Let  cos-1 (1/2) = x. Then, cos x =1/2 = cos (π/3)  so cos-1 (1/2) = (π/3) Let, sin-1(1/2) = y. Then sin y = 1/2= sin(π/6) so sin-1 (1/2) = (π/6) so cos-1(1/2) + 2sin-1(1/2) = (π/3) + (2π/6) = (2π/3)