From 17ab1d9b50bad5faf1812b66a0b820f0671e2443 Mon Sep 17 00:00:00 2001
From: Michiel Meeuwissen <michiel.meeuwissen@gmail.com>
Date: Fri, 13 Dec 2024 08:57:42 +0100
Subject: [PATCH] Details only.

---
 .../dihedral/DihedralSymmetry.java            | 29 ++++++++++---------
 1 file changed, 15 insertions(+), 14 deletions(-)

diff --git a/mihxil-algebra/src/main/java/org/meeuw/math/abstractalgebra/dihedral/DihedralSymmetry.java b/mihxil-algebra/src/main/java/org/meeuw/math/abstractalgebra/dihedral/DihedralSymmetry.java
index b0438e41..01b1c53d 100644
--- a/mihxil-algebra/src/main/java/org/meeuw/math/abstractalgebra/dihedral/DihedralSymmetry.java
+++ b/mihxil-algebra/src/main/java/org/meeuw/math/abstractalgebra/dihedral/DihedralSymmetry.java
@@ -4,6 +4,7 @@
 
 import java.util.function.UnaryOperator;
 
+import org.meeuw.math.Utils;
 import org.meeuw.math.abstractalgebra.GroupElement;
 import org.meeuw.math.abstractalgebra.dim2.Matrix2;
 import org.meeuw.math.abstractalgebra.dim2.Vector2;
@@ -97,21 +98,21 @@ public String toString() {
 
     public Matrix2 asMatrix2() {
         if (asMatrix == null) {
-            double phi = 2 * Math.PI * k / group.n;
-        double cos = Math.cos(phi);
-        double sin = Math.sin(phi);
-        if (symmetry == r) {
-            return Matrix2.of(
-                cos, -1 * sin,
-                sin, cos
-            );
-        } else {
-            return Matrix2.of(
-                cos, sin,
-                sin, -1 * cos
-            );
+            double phi = Utils.Math_2PI * k / group.n;
+            double cos = Math.cos(phi);
+            double sin = Math.sin(phi);
+            if (symmetry == r) {
+                return Matrix2.of(
+                    cos, -1 * sin,
+                    sin, cos
+                );
+            } else {
+                return Matrix2.of(
+                    cos, sin,
+                    sin, -1 * cos
+                );
+            }
         }
-    }
         return asMatrix;
     }