From 2b61739a02e2be5093f4ac721b40552a742429e5 Mon Sep 17 00:00:00 2001
From: tuohm <952153252@qq.com>
Date: Thu, 6 Aug 2020 20:08:14 +0800
Subject: [PATCH] Sin.java

---
 Sin.java | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 Sin.java

diff --git a/Sin.java b/Sin.java
new file mode 100644
index 0000000..3811d77
--- /dev/null
+++ b/Sin.java
@@ -0,0 +1,91 @@
+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));
+	}
+
+}