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<!DOCTYPE html> <html> <body> <p>Click the button to display the tangent of different numbers.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var a = Math.tan(90); var b = Math.tan(-90); var c = Math.tan(45); var d = Math.tan(60); var x = a + "<br>" + b + "<br>" + c + "<br>" + d; document.getElementById("demo").innerHTML = x; } </script> </body> </html>