} else if (token.equals("acos")) {
stackAnswer.push(complexFormat.format(a.acos()));
} else if (token.equals("arg")) {
stackAnswer.push(complexFormat.format(a.getArgument()));
} else if (token.equals("asin")) {
stackAnswer.push(complexFormat.format(a.asin()));
} else if (token.equals("atan")) {
stackAnswer.push(complexFormat.format(a.atan()));
} else if (token.equals("conj")) {
stackAnswer.push(complexFormat.format(a.conjugate()));
} else if (token.equals("cos")) {