method

acos

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acos(z) public

Returns the arc cosine of z

CMath.acos(1 + 1i) #=> (0.9045568943023813-1.0612750619050357i)

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# File lib/cmath.rb, line 281
  def acos(z)
    begin
      if z.real? and z >= -1 and z <= 1
        RealMath.acos(z)
      else
        (-1.0).i * log(z + 1.0.i * sqrt(1.0 - z * z))
      end
    rescue NoMethodError
      handle_no_method_error
    end
  end

acos

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