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my_calculator_2/calculator.html

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<!DOCTYPE html><html><head>
<title>Calculator</title><meta charset="utf-8">
<script type="text/javascript">
function cube() {
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var num = document.getElementById("n1");
num.value = Math.pow(num.value, 3);
}
function square() {
var num = document.getElementById("n1");
num.value = Math.pow(num.value, 2);
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}
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function inverse() {
var num = document.getElementById("n1");
num.value = Math.pow(num.value, -1);
}
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</script>
</head>
<body>
<h1>Calculadora de Fernando Sánchez</h1>
Number:
<input type="text" id="n1"><p>
<button onclick="cube()"> x^3 </button>
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<button onclick="square()"> x^2 </button>
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<button onclick="inverse()"> 1/x </button>
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</body>
</html>