package ¼Ó¼õ³Ë³ý;
import java.util.*;
public class d {
	String s;
	double x;
	public d(String s,double x)
	{
		this.s=s;
		this.x=x;
	}
	public double sanjiao()
	{
		if (s.equals("sin")) return sin(x);
		else if (s.equals("cos")) return cos(x);
		else if (s.equals("tan")) return tan(x);
		else if (s.equals("asin")) return asin(x);
		else if (s.equals("acos")) return acos(x);
		else if (s.equals("atan")) return atan(x);
		else return Double.POSITIVE_INFINITY;
	}
	private double sin(double x) {return Math.sin(x);}
	private double cos(double x) {return Math.cos(x);}
	private double tan(double x) {return Math.tan(x);}
	private double asin(double x) {return Math.asin(x);}
	private double acos(double x) {return Math.acos(x);}
	private double atan(double x) {return Math.atan(x);}
}