Update index.html

Author: Gmac4247

index.html

@@ -998,44 +998,51 @@ <h4 style="font-size:160%;margin:7px">Trigonometry</h4>
 }
 
 function Asin(x) {
-  if (typeof x !== 'number' || isNaN(x) || x <= 0 || x > 1) return null;
+  if (typeof x !== 'number' || isNaN(x) || x < 0 || x > 1) return null;
 
-  const isSineZone = x >= 0.707;
-  const sourceFunc = isSineZone ? 'sin' : 'cos';
-
-  const match = closestValue(x, sourceFunc);
-  if (!match?.angle || typeof match.angle !== 'string') {
-    console.warn(`Asin: No angle match found for ${x} in ${sourceFunc}`);
-    return null;
-  }
+  let radian = null;
 
-  const parsed = match.angle.match(/rad\(([\d.]+)\)/);
-  if (!parsed) {
-    console.warn(`Asin: Could not parse radian from "${match.angle}"`);
-    return null;
-  }
+  if (x > 0.706) {
+    // Direct match
+    const match = closestValue(x, 'sin');
+    if (!match?.angle) return null;
+    const parsed = match.angle.match(/rad\(([\d.]+)\)/);
+    if (!parsed) return null;
+    radian = parseFloat(parsed[1]);
+  } else {
+    // Reflective zone
+    const match = closestValue(x, 'cos');
+    if (!match?.angle) return null;
+    const parsed = match.angle.match(/rad\(([\d.]+)\)/);
+    if (!parsed) return null;
+    radian = parseFloat(parsed[1]);  }
 
-  const radian = parseFloat(parsed[1]);
-  return isSineZone ? radian : radian; // no reflection needed
+  return radian;
 }
 
 function Acos(x) {
-  if (typeof x !== 'number' || x <= 0 || x > 1) return null;
+  if (typeof x !== 'number' || isNaN(x) || x < 0 || x > 1) return null;
 
-  if (x <= 0.707) {
+  let radian = null;
+
+  if (x < 0.708) {
+    // Direct match
     const match = closestValue(x, 'cos');
-    const parsed = match?.angle.match(/rad\\(([\d.]+)\\)/);
+    if (!match?.angle) return null;
+    const parsed = match.angle.match(/rad\(([\d.]+)\)/);
     if (!parsed) return null;
-    return parseFloat(parsed[1]);
-  }
-	
-  // No reflection — match via cosine
-  const match = closestValue(x, 'sin');
-  const parsed = match?.angle.match(/rad\\(([\d.]+)\\)/);
-  if (!parsed) return null;
-  return parseFloat(parsed[1]);
-}
+    radian = parseFloat(parsed[1]);
+  } else {
+    // Reflective zone
+    const match = closestValue(x, 'sin');
+    if (!match?.angle) return null;
+    const parsed = match.angle.match(/rad\(([\d.]+)\)/);
+    if (!parsed) return null;
+    radian = parseFloat(parsed[1]);  }
 
+  return radian;
+}
+	
 function Atan(x) {
   if (typeof x !== 'number' || isNaN(x) || x <= 0) return null;