9-30 Find the limit or show that it does not exist. 9. lim_{x??} (3x - 2) / (2x + 1) 10. lim_{x??} (1 - x²) / (x³ - x + 1) 11. lim_{x?-?} (x - 2) / (x² + 1) 12. lim_{x?-?} (4x³ + 6x² - 2) / (2x³ - 4x + 5) 13. lim_{t??} (?t + t²) / (2t - t²) 14. lim_{t??} (t - t?t) / (2t^{3/2} + 3t - 5) 15. lim_{x??} (2x² + 1)² / ((x - 1)²(x² + x)) 16. lim_{x??} x² / ?(x? + 1) 17. lim_{x??} ?(9x? - x) / (x³ + 1) 18. lim_{x?-?} ?(9x? - x) / (x³ + 1) 19. lim_{x??} (?(9x² + x) - 3x) 20. lim_{x?-?} (x + ?(x² + 2x)) 21. lim_{x??} (?(x² + ax) - ?(x² + bx)) 22. lim_{x??} cos x 23. lim_{x??} (x? - 3x² + x) / (x³ - x + 2) 24. lim_{x??} ?(x² + 1) 25. lim_{x?-?} (x? + x?) 26. lim_{x?-?} (1 + x?) / (x? + 1) 27. lim_{x??} (x - ?x) 28. lim_{x??} (x² - x?) 29. lim_{x??} x sin(1/x) 30. lim_{x??} ?x sin(1/x)
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