public static double sin(double x, double eps) {
        double result = 0d;
        double diff = eps + 1.0;
        for (int n = 0; diff > eps; n++) {
            diff = 1d;
            int pow = 2 * n + 1;
            for (int m = 1; m <= pow; m++) {
                diff *= x;
                diff /= m;
            }
            if (n % 2 == 1)
                diff *= (-1d);
            result += diff;
            diff = Math.abs(diff);
        }
        return result;
    }