Update index.html

Author: Gmac4247

index.html

@@ -993,18 +993,25 @@ <h4 style="font-size:160%;margin:7px">Trigonometry</h4>
 }
 
 function Atan(x) {
-if (typeof x !== 'number' || isNaN(x) || x <= 0) return null;
+  if (typeof x !== 'number' || isNaN(x) || x <= 0) return null;
 
-// Direct match zone
-if (x > 1 || x < 0.089) {
-  const match = closestValue(x, 'tan');
-  return match?.angle ?? null;
-}
+  let match = null;
+
+  // Direct match zone
+  if (x > 1 || x < 0.089) {
+    match = closestValue(x, 'tan');
+  } else {
+    // Reflective zone (0.089 < x < 1)
+    const reciprocal = 1 / x;
+    match = closestValue(reciprocal, 'tan');
+  }
+
+  if (!match?.angle) return null;
+
+  const angleMatch = match.angle.match(/rad\(([\d.]+)\)/);
+  if (!angleMatch) return null;
 
-// Reflective zone (0.089 < x < 1)
-const reciprocal = 1 / x;
-const match = closestValue(reciprocal, 'tan');
-return match?.angle ?? null;
+  return parseFloat(angleMatch[1]);
 }
 
 </script>