Using radians:
  sin(-pi / 6)     = -0.49999999999999994
  cos(3 * pi / 4)  = -0.7071067811865475
  tan(pi / 3)      = 1.7320508075688767
  asin(-1 / 2)     = -0.5235987755982988
  acos(-sqrt(2)/2) = 2.356194490192345
  atan(sqrt(3))    = 1.0471975511965979
Using degrees:
  sin(-30)         = -0.49999999999999994
  cos(135)         = -0.7071067811865475
  tan(60)          = 1.7320508075688767
  asin(-1 / 2)     = -29.999999999999996
  acos(-sqrt(2)/2) = 135
  atan(sqrt(3))    = 60.00000000000001