diff --git a/index.html b/index.html
index 9f62b48..6495afd 100644
--- a/index.html
+++ b/index.html
@@ -4,7 +4,7 @@
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>Document</title>
+    <title>Scientific Calculator</title>
     <link rel="stylesheet" href="style.css">
     <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet"
         integrity="sha384-KK94CHFLLe+nY2dmCWGMq91rCGa5gtU4mk92HdvYe+M/SXH301p5ILy+dN9+nJOZ" crossorigin="anonymous">
@@ -23,11 +23,18 @@ <h1 class="text-center mt-3">Scientific Calculator</h1>
                         </div>
                         <div class="input p-3">
                             <div class="row justify-content-center">
+                                <button class="btn col-2 mx-md-2 mx-1 mb-2" onclick="percentage()">e</button>
+                                <button class="btn col-2 mx-md-2 mx-1 mb-2" onclick="factorial()">sin</button>
+                                <button class="btn col-2 mx-md-2 mx-1 mb-2" onclick="parenthesesOpen()">cos</button>
+                                <button class="btn col-2 mx-md-2 mx-1 mb-2" onclick="parenthesesClose()">tan</button>
+                                <button class="btn col-2 mx-md-2 mx-1 mb-2" onclick="clearData()">AC</button>
+                            </div>
+                            <div class="row justify-content-center">
+                                <button class="btn col-2 mx-md-2 mx-1 mb-2" >π</button>
                                 <button class="btn col-2 mx-md-2 mx-1 mb-2" onclick="factorial()">x!</button>
                                 <button class="btn col-2 mx-md-2 mx-1 mb-2" onclick="parenthesesOpen()">(</button>
                                 <button class="btn col-2 mx-md-2 mx-1 mb-2" onclick="parenthesesClose()">)</button>
                                 <button class="btn col-2 mx-md-2 mx-1 mb-2" onclick="percentage()">%</button>
-                                <button class="btn col-2 mx-md-2 mx-1 mb-2" onclick="clearData()">AC</button>
                             </div>
                             <div class="row justify-content-center">
                                 <button class="btn col-2 mx-md-2 mx-1 mb-2" onclick="logNatural()">ln</button>
diff --git a/script.js b/script.js
index 77283ff..f3b6226 100644
--- a/script.js
+++ b/script.js
@@ -23,7 +23,6 @@ function clearData() {
 
 //------------------ NUMBER --------------------------
 function number(value) {
-    data.staging = [];
     data.staging.push(value);
     result.value = data.staging.join('');
     console.log(data);
@@ -305,12 +304,18 @@ function parenthesesOpen() {
         data.staging = [];
         operation.value = data.formats.join('');
         result.value = data.result;
-    } else if (data.staging.length === 0 && isNaN(parseFloat(data.operations[data.operations.length - 1]))) {
+    } else if (data.staging.length === 0 && isNaN(parseFloat(data.operations[data.operations.length - 1])) && data.operations[data.operations.length - 1] !== ")") {
         data.operations.push('(');
         data.formats.push('(');
         data.staging = [];
         operation.value = data.formats.join('');
         result.value = data.result;
+    }else if (data.staging.length === 0 && data.operations[data.operations.length - 1] === ")"){
+        data.operations.push('*', '(');
+        data.formats.push('×', '(');
+        data.staging = [];
+        operation.value = data.formats.join('');
+        result.value = data.result;
     }
     console.log(data);
 }
