public class d {
    public static double angle(double a, String b) {
        double c = Math.toRadians(a);
        if (a % 180 == 0 && b.equals("sin")) {
            return 0;
        }
        if (a % 90 == 0 && a % 180 != 0 && b.equals("cos")) {
            return 0;
        }

        switch (b) {
            case "cos":
                return Math.cos(c);
            case "sin":
                return Math.sin(c);
            case "tan":
                return Math.tan(c);
            case "cot":
                return 1 / Math.tan(c);
        }
        return -1;
    }
}