Considering the principal values of the inverse trigonometric functions, the sum of all the solutions of the equation $\cos^{-1}x - 2\sin^{-1}x = \cos^{-1}(2x)$ is equal to (1) 0 (2) 1 (3) $\frac{1}{2}$ (4) $-\frac{1}{2}$
Considering the principal values of the inverse trigonometric functions, the sum of all the solutions of the equation $\cos^{-1}x - 2\sin^{-1}x = \cos^{-1}(2x)$ is equal to\\
(1) 0\\
(2) 1\\
(3) $\frac{1}{2}$\\
(4) $-\frac{1}{2}$