diff --git a/OOP/Java/Lab/Week3/SqInvAndSinCalc.java b/OOP/Java/Lab/Week3/SqInvAndSinCalc.java
index 7e269b1..32d6899 100644
--- a/OOP/Java/Lab/Week3/SqInvAndSinCalc.java
+++ b/OOP/Java/Lab/Week3/SqInvAndSinCalc.java
@@ -14,18 +14,26 @@ public class SqInvAndSinCalc {
         System.out.println("Enter the input in degrees for the Sine function:");
         double y = sc.nextDouble();
 
-        double x = (y) * (3.1415926 / 180.0);
-        double sinx = x;
+        double x = y * (3.1415926 / 180.0);
+        sinx = x;
         int n = 1;
-        
+
         for (int i = 1; i <= terms; i++) {
-            double term = pow(-1, n) * pow(x, 2 * n + 1) / tgamma(2 * n + 1);
+            double term = Math.pow(-1, n) * Math.pow(x, 2 * n + 1) / factorial(2 * n + 1);
             sinx += term;
             n++;
         }
 
-        System.out.println("The value of Sin("+x+") is: "+sinx);
+        System.out.println("The value of Sin(" + x + ") is: " + sinx);
 
-        System.out.println("The sum is "+sum);
+        System.out.println("The sum is " + sum);
+    }
+
+    public static double factorial(int n) {
+        double result = 1;
+        for (int i = 2; i <= n; i++) {
+            result *= i;
+        }
+        return result;
     }
 }