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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">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="style.css">
<title>Calculator</title>
</head>
<body>
<div class="container">
<h1>Calculator </h1>
<div class="calculator">
<input type="text" name="screen" id="screen">
<table>
<tr>
<td><button>(</button></td>
<td><button>)</button></td>
<td><button>C</button></td>
<td><button>%</button></td>
</tr>
<tr>
<td><button>7</button></td>
<td><button>8</button></td>
<td><button>9</button></td>
<td><button>X</button></td>
</tr>
<tr>
<td><button>4</button></td>
<td><button>5</button></td>
<td><button>6</button></td>
<td><button>-</button></td>
</tr>
<tr>
<td><button>1</button></td>
<td><button>2</button></td>
<td><button>3</button></td>
<td><button>+</button></td>
</tr>
<tr>
<td><button>0</button></td>
<td><button>.</button></td>
<td><button>/</button></td>
<td><button>=</button></td>
</tr>
</table>
</div><br><br>
<form name="myform">
<input type="text" name="txt"><br>
<input type="button" name="sin" value="sin" onclick="sinfunction()">
<input type="button" name="cos" value="cos" onclick="cosfunction()">
<input type="button" name="tan" value="tan" onclick="tanfunction()">
<input type="button" name="cot" value="cot" onclick="cotfunction()">
<input type="button" name="sec" value="sec" onclick="secfunction()">
<input type="button" name="cosec" value="cosec" onclick="cosecfunction()">
</form>
</div>
</body>
<script src="script.js">
// function sinfunction(){
// myform.txt.value=Math.sin(myform.txt.value);
// }
// function cosfunction(){
// myform.txt.value=Math.cos(myform.txt.value);
// }
// function tanfunction(){
// myform.txt.value=Math.tan(myform.txt.value);
// }
</script>
</html>