Verify that each x-value is a solution of the equation.
1. tan x - √3 = 0
(a) x = π / 3
(b) x = 4π / 3
2. sec x -2 = 0
(a) x = π / 3
(b) x = 5π / 3
3. 3 tan2 2x - 1 = 0
(a) x = π / 12
(b) x = 5π / 12
4. 2 cos2 4x - 1 = 0
(a) x = π / 16
(b) x = 3π /16