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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Scientific Calculator</title>
<link rel="icon" href="icon.png">
<link rel="stylesheet" href="index.css">
</head>
<body>
<h1 align="center">Scientific Calculator</h1>
<hr>
<div class="container">
<h3>Scientific Calculator</h3>
<input type="text" id="screen" placeholder="0"><br><br>
<button onclick="backspace()">CE</button>
<button onclick="factorial()">X!</button>
<button class="btn">(</button>
<button class="btn">)</button>
<button class="btn">%</button>
<button onclick="screen.value=''">CLR</button> <br><br>
<button onclick="sin()">sin</button>
<button onclick="pi()">ℼ</button>
<button class="btn">7</button>
<button class="btn">8</button>
<button class="btn">9</button>
<button class="btn">/</button> <br> <br>
<button onclick="cos()">cos</button>
<button onclick="log()">log</button>
<button class="btn">4</button>
<button class="btn">5</button>
<button class="btn">6</button>
<button class="btn">*</button> <br><br>
<button onclick="tan()">tan</button>
<button onclick="sqrt()">√</button>
<button class="btn">1</button>
<button class="btn">2</button>
<button class="btn">3</button>
<button class="btn">-</button> <br><br>
<button onclick="f1()">e</button>
<button onclick="pow()">x <sup>2</sup></button>
<button class="btn">0</button>
<button class="btn">.</button>
<button onclick="screen.value=eval(screen.value);">=</button>
<button class="btn">+</button> <br><br>
<button onclick="radian()">Rad</button>
<button onclick="degree()">Deg</button>
</div>
<script src="index.js"></script>
</body>
</html>