For the following exercises, evaluate the expressions, writing the result as a simplified complex number.
49. 1/i + 4/i³ =
50. 1/i¹¹ - 1/i²¹ =
51. i⁷ (1+i²) = 52. i⁻³ + 5i⁷ =
53. (2+i)(4-2i)/(1+2i) =
54. (1+3i)(2-4i)/(1+2i) = 55. (3+i)²/(1+2i) =
56. (3+2i/2+1) + (4+3i) = 57. 4+i/i + 3-4i/1-i = 58. 3+2i/1+2i - 2-3i/3+i =
