Thread: calculate sin(x)

How can I transform this code to calculate the sin(x) in the method?

public static double getCos(double degrees, int n) {
double cos = 0;
double numerator = 0;
int denominator = 0;
for (int i = 0; i <= n; i++, i++) {
numerator = getNumerator(degrees, i);
denominator = getFactorial(2 * i + 1);
cos += numerator / denominator;

package cosx;
 
import java.util.Scanner;
 
public class cosx2 {
 
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
 
		System.out.print("Enter the degree: ");
		double degree = input.nextDouble(); 
 
		double radian = getRadian(degree);
 
		calculateCos(input, radian,degree);
 
	}
 
 
	public static double getRadian(double x) {		
		return x = (Math.PI/180)*x;		
	}
 
	private static void calculateCos(Scanner std, double rad, double deg) {
		System.out.print("How many terms do you want to calculate the cos: ");
		int terms = std.nextInt();
		double top;
		double bottom;
		double sum=0;
 
		for(int i = 0; i<= terms; ++i){
			top = Math.pow(-1, i);			
			bottom =1;
			int repeat = 2*i+1;
			for(int j = 1; j <= repeat; ++j){				
				bottom *= j; 
			}
			if(i%2 == 0)
				sum += (top/bottom);
			else
				sum -= (top/bottom);
		}
		System.out.printf("The sin (%.1f", deg);
		System.out.printf(") is %.6f", sum);		
	}
}

I cannot figure out how to input the function to calculate the cosine?

Screen Shot 2013-11-06 at 11.02.03 AM.jpg

If you click the image it will expand....

import java.util.Scanner;
 
public class cosx2 {
 
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
 
		System.out.print("Enter the degree please: ");
		double degree = input.nextDouble(); 
 
		double radian = getRadian(degree);
 
		calculateCos(input, radian,degree);
 
	}
 
 
	public static double getRadian(double x) {		
		return x = (Math.PI/180)*x;		
	}
 
	private static void calculateCos(Scanner std, double rad, double deg) {
		System.out.print("How many terms do you want to calculate the cos: ");
		int terms = std.nextInt();
		double num;
		double den;
		double sum=0;
 
		for(int i = 0; i<= terms; ++i){
			num = Math.pow(-1, i);			
			den = factorial(2*i);
			int repeat = 2*i+1;
			for(int j = 1; j <= repeat; ++j){				
				den *= j; 
			}
			if(i%2 == 0)
				sum += (num/den);
			else
				sum -= (num/den);
		}
		System.out.printf("The cos (%.1f", deg);
		System.out.printf(") is %.6f", sum);
		System.out.println("The calcuated value of cos was " +sum+ 
				" Howver the real value of cose was " + Math.cos(deg));
 
	}
}

Screen Shot 2013-11-06 at 11.11.44 AM.jpg