acos -- arccosine

Synopsis

• Usage:

  acos x

• Inputs:
  • x
• Outputs:
  • a number, the arccosine (in radians) of x

Description

i1 : acos 0.5

o1 = 1.0471975511966

o1 : RR (of precision 53)

See http://en.wikipedia.org/wiki/Trigonometric_function.