Use tables of values to make educated guesses for each of the limits in Exercises 39–52. 39. lim (x2 + x+ 1) 40. lim (1 – 3x +x²) x+2- X3+ 1 41. lim 1+2 x2 – 4 1 42. lim x1 1- x х — 3 х — 5 43. lim x-3 (x2 – 2)(x – 3) 44. lim x+5 x2 – 25 3 45. lim X+2 4 - 2* 2x 46. lim (Зe + 1) X00 Зх + 1 1+ 2x 47. lim X-00 1- r 48. lim X00 Y -1 x+1 1 + 2x +1 1 49. lim x-0 x2 - 1 50. lim (1+ X00 51. lim sinx 52. lim sin x00