---
title: Math.atan()
slug: Web/JavaScript/Reference/Global_Objects/Math/atan
translation_of: Web/JavaScript/Reference/Global_Objects/Math/atan
original_slug: Web/JavaScript/Referencia/Objectes_globals/Math/atan
---
<div>{{JSRef("Global_Objects", "Math")}}</div>

<h2 id="Summary" name="Summary">Resum</h2>

<p>La funció <strong><code>Math.atan()</code></strong> retorna l'arctangent (en radians) d'un nombre, és a dir:</p>

<p><math display="block"><semantics><mrow><mstyle mathvariant="monospace"><mrow><mo lspace="0em" rspace="thinmathspace">Math.atan</mo><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo></mrow></mstyle><mo>=</mo><mo lspace="0em" rspace="0em">arctan</mo><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo><mo>=</mo><mtext> l'unic </mtext><mspace width="thickmathspace"></mspace><mi>y</mi><mo>∊</mo><mrow><mo>[</mo><mrow><mo>-</mo><mfrac><mi>π</mi><mn>2</mn></mfrac><mo>;</mo><mfrac><mi>π</mi><mn>2</mn></mfrac></mrow><mo>]</mo></mrow><mspace width="thinmathspace"></mspace>tal que<mtext></mtext><mspace width="thickmathspace"></mspace><mo lspace="0em" rspace="0em">tan</mo><mo stretchy="false">(</mo><mi>y</mi><mo stretchy="false">)</mo><mo>=</mo><mi>x</mi></mrow><annotation encoding="TeX">\mathtt{\operatorname{Math.atan}(x)} = \arctan(x) = \text{ the unique } \; y \in \left[-\frac{\pi}{2}; \frac{\pi}{2}\right] \, \text{such that} \; \tan(y) = x</annotation></semantics></math></p>

<h2 id="Syntax" name="Syntax">Sintaxi</h2>

<pre class="syntaxbox"><code>Math.atan(<var>x</var>)</code></pre>

<h3 id="Parameters" name="Parameters">Paràmetres</h3>

<dl>
 <dt><code>x</code></dt>
 <dd>Un nombre.</dd>
</dl>

<h2 id="Description" name="Description">Descripció</h2>

<p>El mètode <code>Math.atan()</code> retorna un valor numèric entre <math><semantics><mrow><mo>-</mo><mfrac><mi>π</mi><mn>2</mn></mfrac></mrow><annotation encoding="TeX">-\frac{\pi}{2}</annotation></semantics></math> i <math><semantics><mfrac><mi>π</mi><mn>2</mn></mfrac><annotation encoding="TeX">\frac{\pi}{2}</annotation></semantics></math> radians.</p>

<p>Degut a que <code>atan()</code> és un mètode estàtic de <code>Math</code>, sempre s'utilitza com a <code>Math.atan()</code>, en comptes de com a mètode d'una instància de <code>Math</code> (<code>Math</code> no és un constructor).</p>

<h2 id="Examples" name="Examples">Exemples</h2>

<h3 id="Example:_Using_Math.atan" name="Example:_Using_Math.atan">Exemple: Utilitzar <code>Math.atan()</code></h3>

<pre class="brush: js">Math.atan(1);  // 0.7853981633974483
Math.atan(0);  // 0
</pre>

<h2 id="Specifications" name="Specifications">Especificacions</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Especificació</th>
   <th scope="col">Estat</th>
   <th scope="col">Comentaris</th>
  </tr>
  <tr>
   <td>ECMAScript 1a Edició.</td>
   <td>Standard</td>
   <td>Definició inicial. Implementat a JavaScript 1.0.</td>
  </tr>
  <tr>
   <td>{{SpecName('ES5.1', '#sec-15.8.2.4', 'Math.atan')}}</td>
   <td>{{Spec2('ES5.1')}}</td>
   <td> </td>
  </tr>
  <tr>
   <td>{{SpecName('ES6', '#sec-math.atan', 'Math.atan')}}</td>
   <td>{{Spec2('ES6')}}</td>
   <td> </td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility" name="Browser_compatibility">Compatibilitat amb navegadors</h2>

<div>{{CompatibilityTable}}</div>

<div id="compat-desktop">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Característica</th>
   <th>Chrome</th>
   <th>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari</th>
  </tr>
  <tr>
   <td>Suport bàsic</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Característica</th>
   <th>Android</th>
   <th>Chrome for Android</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>IE Mobile</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
  </tr>
  <tr>
   <td>Suport bàsic</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<h2 id="See_also" name="See_also">Vegeu també</h2>

<ul>
 <li>{{jsxref("Math.acos()")}}</li>
 <li>{{jsxref("Math.asin()")}}</li>
 <li>{{jsxref("Math.atan2()")}}</li>
 <li>{{jsxref("Math.cos()")}}</li>
 <li>{{jsxref("Math.sin()")}}</li>
 <li>{{jsxref("Math.tan()")}}</li>
</ul>