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Formula input


 

 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8" />
    <title></title>
<style type="text/css" media="Screen">
* .nowrap {
  white-space: nowrap;
}

* .preserved {
  white-space: pre;
}

</style>
</head>
<body>
<p><code class="nowrap preserved">a = x(y<sup>2</sup> + z<sup>3</sup>) + 1</code>. 

</body>
</html>