(n = 0,1,2....) 1. x = pi/3 + 2pi*n2. x = 4*pi/3 + 2pi*n3. x = arcsin0,3 +2pi*n4. x = arcsin(-0,4) + 2pi*n5. x = pi/3 +2pi*n6. x = pi/3 +2pi*n7. x = 4*pi/3+2pi*n8. x = pi/3+2pi*n9. x = 4*pi/3+2pi*n10. x = pi*n 11. x = pi/2 +2pi*n12. x = pi*n13. x = pi/2 + pi*n 14. x = pi/4 + pi*n15. x = -pi/4+pi*n16. x = pi/3+pi*n17. x = -pi/3+pi*n18. x = pi + 2pi*n19. нет решения, cos э [-1;1]20. x = -pi/2+2pi*n.