In Exercises 59 - 68, solve the equation. 59. arccos(20) = 60. T - 2 arcsin (2) = 2x 61. 4 arctan(3x - 1) - 1 = 0 62. 6 arccot (2x) - 57 = 0 63. 4 arcsec ( ) = 64. 12 arcesc (}) = 2x 65. 9 arcsin (2) - 12 = 0 66. 9 arccos-(x) - 12 = 0 67. 8 arccot(x) + 342 = 10# arccot(@) 68. 6 arctan(r) = 7 arctan(x) + 12