Method integral

MathParser/src/com/aghajari/math/Functions.java:237–239

(MathParser parser, String variableName, String exp, double lowerLimit, double upperLimit)

    }

    public static double integral(MathParser parser, String variableName, String exp, double lowerLimit, double upperLimit) throws MathParserException {
        return integral(parser, variableName, exp, lowerLimit, upperLimit, 20);
    }

    public static double integral(MathParser parser, String variableName, String exp, double lowerLimit, double upperLimit, double glPoints) throws MathParserException {
        if (!Utils.isIdentifier(variableName))