method

acosh

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acosh(z) public

returns the inverse hyperbolic cosine of z

# File lib/cmath.rb, line 314
  def acosh(z)
    begin
      if z.real? and z >= 1
        acosh!(z)
      else
        log(z + sqrt(z * z - 1.0))
      end
    rescue NoMethodError
      handle_no_method_error
    end
  end

acosh

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