The Math.tan()
static method returns the tangent of a number in radians.
The Math.tan()
static method returns the tangent of a number in radians.
Math.tan(x)
x
A number representing an angle in radians.
Because tan()
is a static method of Math
, you always use it as Math.tan()
, rather than as a method of a Math
object you created (Math
is not a constructor).
Math.tan(-Infinity); // NaN Math.tan(-0); // -0 Math.tan(0); // 0 Math.tan(1); // 1.5574077246549023 Math.tan(Math.PI / 4); // 0.9999999999999999 (Floating point error) Math.tan(Infinity); // NaN
It's not possible to calculate tan(π/2)
exactly.
Math.tan(Math.PI / 2); // 16331239353195370 Math.tan(Math.PI / 2 + Number.EPSILON); // -6218431163823738
Because the Math.tan()
function accepts radians, but it is often easier to work with degrees, the following function accepts a value in degrees, converts it to radians and returns the tangent.
function getTanDeg(deg) { const rad = (deg * Math.PI) / 180; return Math.tan(rad); }
Specification |
---|
ECMAScript Language Specification # sec-math.tan |
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | Deno | Node.js | ||
tan |
1 | 12 | 1 | 3 | 1 | 18 | 4 | 10.1 | 1 | 1.0 | 4.4 | 1.0 | 0.10.0 |
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/tan