index.html

<!DOCTYPE html>
<html>
	<head>
		<title>Calculator</title>
		<meta charset="utf-8">
	</head>
	<body>
		<h1>Calculadora de Ramón Hernández García</h1>
		Number:
		<input type="text" id="n1">
		<p>
			<button onclick="cube()"> x^3 </button>
			<button onclick="power_4()"> x^4</button>
                        <button onclick="sine()"> sin </button>
		</p>
		<script type="text/javascript">
			function cube() {
				var num = document.getElementById("n1");
				num.value = Math.pow(num.value, 3);
			}
			function power_4() {
				var num = document.getElementById("n1");
				num.value = Math.pow(num.value, 4);
			}
                        function sine() {
                                var num = document.getElementById("n1");
                                num.value = Math.sin(num.value);
			}
		</script>
	</body>
</html>