pxfqpjoma/Sin.java

package sin;

public class Sin {

	public static double number;
	public static double PI = 3.14159265358979323846;
	
	
	public Sin() {
		
	}
	
	public static double sin(double num) {
		
		double tmp = Math.toRadians(num);
		number=Math.sin(tmp);
		
		return number;
		
	}
	
	public static double cos(double num) {
		
		double tmp = Math.toRadians(num);
		
		return Math.cos(tmp);
		
	}
	
	public static double mysin(double x)
	{
		while(x>2*PI) x -= 2*PI;
		while(x<0) x += 2*PI;
		
		double index, result=0;
		int i=1;
		do{
			index = mypow(x,i) / factorial(i);
			result += mypow(-1,i/2) * index;
			i += 2;
		}
		while(index>1e-6);
		return result;
	}
	
	public static double factorial(double i) {
		
		if(i==0) 
			return 1;
		else 
			return i*factorial(i-1);
	}
	
	public static double mypow(double x,int i) {
			
		if(i>0) 
			return x*mypow(x, i-1);
		else if(i<0) 
			return 1/x*mypow(x, i+1);
		else 
			return 1;
		
		
	}
	
	public static double mycos(double x) {
		while(x>2*PI) x -= 2*PI;
		while(x<0) x += 2*PI;
		
		double index, result=0;
		int i=0;
		
		do{
			index = mypow(x,i) / factorial(i);
			result += mypow(-1,i/2) * index;
			i += 2;
		}
		while(index>1e-6);
		
		return result;
	}
	public static double toRadians(double angdeg) {
        return angdeg / 180.0 * PI;
    }
	public static void main(String[] args) {
		
		System.out.println(mysin(toRadians(30)));
		System.out.println(mycos(30));
	}

}