aEnvironment.iCurrentOutput.Write("Function not yet implemented : ArcCos");
BigNumber x; x = GetNumber(aEnvironment, aStackTop, 1); double result = Math.acos(x.Double()); BigNumber z = new BigNumber(aEnvironment.BinaryPrecision()); z.SetTo(result); RESULT(aEnvironment, aStackTop).Set(new LispNumber(z));
    public void Eval(LispEnvironment aEnvironment,int aStackTop) throws Exception    {      aEnvironment.iCurrentOutput.Write("Function not yet implemented : ArcCos");//TODO FIXME    }