Question

How to use Math.tan() to get the tangent of a number in JavaScript

Answer 1

document.write("Math.tan(45 * Math.PI / 180.0) = " + Math.tan(45 * Math.PI / 180.0) + "<br />");
document.write("Math.tan(3 * Math.PI / 4) = " + Math.tan(3 * Math.PI / 4) + "<br />");
document.write("Math.tan(5 * Math.PI / 4) = " + Math.tan(5 * Math.PI / 4) + "<br />");
document.write("Math.tan(7 * Math.PI / 4) = " + Math.tan(7 * Math.PI / 4) + "<br />");
document.write("Math.tan(Math.PI / 4) = " + Math.tan(Math.PI / 4) + "<br />");
document.write("Math.tan(0.0) = " + Math.tan(0.0) + "<br />");
document.write("Math.tan(-0.0) = " + Math.tan(-0.0) + "<br />");
document.write("Math.tan(1) = " + Math.tan(1) + "<br />");

 
/*
run

Math.tan(45 * Math.PI / 180.0) = 0.9999999999999999
Math.tan(3 * Math.PI / 4) = -1.0000000000000002
Math.tan(5 * Math.PI / 4) = 0.9999999999999997
Math.tan(7 * Math.PI / 4) = -1.0000000000000004
Math.tan(Math.PI / 4) = 0.9999999999999999
Math.tan(0.0) = 0
Math.tan(-0.0) = 0
Math.tan(1) = 1.5574077246549023
 
*/

 

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