37. an = 1 + 4n2 1 + n2 пт 38. an = cos n+ 1 39. an n? In + 4n + 40. a.= e2n/{n+2) (-1)"+in 41. an (-1)" 20 42. a,= nt d

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37. an = 1 + 4n2 1 + n2 пт 38. an = cos n+ 1 39. an n? In + 4n + 40. a.= e2n/{n+2) (-1)"+in 41. an (-1)" 20 42. a,= nt du 43. (2n 1)! (2n + 1)! 44. In n In(2n) tanin 45. {sin n) 46. an n 48. a, = ln(n + 1) - Inn In1) 47. {n’e"} cos'n 2" 49. a. 50. an = "21+3m 51. a, = n sin(1/n) 52. an = 2 "cos NTT 11 53. a. 1 + 54. a,= n/n n 55. an = ln(2n2 + 1) – In(n+ 1) (In n2 56. an = n