import java.util.Scanner;
import java.lang.Math;
import java.lang.*;

/**
 * @Joshua Chung & Mexi Liang
 * @1.0   05/27/2018
 */

public class Calculator extends Main{         

    public double add(double x, double y){
        return x + y;        
    }

    public double subtract(double x, double y){
        return x - y;
    }        

    public double multiply(double x, double y){
        return x * y;
    }

    public double divide(double x, double y){
        return x / y;
    }

    public double getPow(double x, double y){
        return Math.pow(x, y);    
    }

    public double invert(double x){
        return x * (-1);
    }       

    public double square(double x){
        return x * x;
    }

    public double squareRoot(double x){
        return Math.sqrt(x);
    }

    public double getInverse(double x){
        return (1/x);           
    }

    public double getCosine(double x){         
        return Math.cos(x);
    }

    public double getSine(double x){
        return Math.sin(x);
    }

    public double getTan(double x){
        return Math.tan(x);
    }

    public double inverseSin(double x){
        return Math.asin(x);
    }

    public double inverseCos(double x){
        return Math.acos(x);
    }

    public double inverseTan(double x){
        return Math.atan(x);
    }

    public static double factorial(double x){
        double result = 1;

        for(double value = 2; value <= x; value++) {
            result *= value;
        }                
        return result;                     
    }

    public double log(double x){
        return Math.log10(x);
    }

    public double inverseLog(double x){
        return Math.exp(x);
    }

    public double natLog(double x){
        return Math.log(x);
    }

    public long round(double x){
        return Math.round(x);
    }
}