Estimate the limits or show it does not exist.

x2 x-11-x2 7. lim x - 4 x=2 x - 4x +4 9. lim -4 x+-2 + x + 4x +4 x-9 x+3x-3 11. lim 13. lim 15. lim x-x x+0+ 17. lim x-x2 +x 1-x 19. lim 3x-x-1 x - 1 x0 x +4 1 21. lim 23. lim x0+x-x2 25. lim sin x 848 27. lim x sin - x-0 X 1 x-4 8. lim x2-5x + 6 10. x-4 lim_2-4x+4 29. _lim_ [x+x - 4x + 1] X118 2-x *4 x-4 12. lim h h0 x +3h-x 14. lim 16. lim x - x x-0 18. lim x-x x+1- 2x + 100 *0 x + 3 20. lim *4 x0 x - 4 22. lim 24. lim 1 x-x COS X 2 x 1/2 26. lim x00x 1 28. lim sin 2 30. lim [x+x - 4x + 1] 818 At what, if any, points in its domain is the function f in E