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----
-title: Math.acos()
-slug: Web/JavaScript/Reference/Global_Objects/Math/acos
-translation_of: Web/JavaScript/Reference/Global_Objects/Math/acos
-original_slug: Web/JavaScript/Referencia/Objectes_globals/Math/acos
----
-<div>{{JSRef("Global_Objects", "Math")}}</div>
-
-<h2 id="Summary" name="Summary">Resum</h2>
-
-<p>La funció <strong><code>Math.acos()</code></strong> retorna l'arccosinus (mesurat en radians) d'un nombre, és a dir:<math display="block"><semantics><mrow><mo></mo><mi>x</mi><mo>∊</mo><mo stretchy="false">[</mo><mrow><mo>-</mo><mn>1</mn></mrow><mo>;</mo><mn>1</mn><mo stretchy="false">]</mo><mo>,</mo><mspace width="thickmathspace"></mspace><mstyle mathvariant="monospace"><mrow><mo lspace="0em" rspace="thinmathspace">Math.acos</mo><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo></mrow></mstyle><mo>=</mo><mo lspace="0em" rspace="0em">arccos</mo><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo><mo>=</mo><mtext> l'únic </mtext><mspace width="thickmathspace"></mspace><mi>y</mi><mo>∊</mo><mo stretchy="false">[</mo><mn>0</mn><mo>;</mo><mi>π</mi><mo stretchy="false">]</mo><mspace width="thinmathspace"></mspace><mtext>tal que</mtext><mspace width="thickmathspace"></mspace><mo lspace="0em" rspace="0em">cos</mo><mo stretchy="false">(</mo><mi>y</mi><mo stretchy="false">)</mo><mo>=</mo><mi>x</mi></mrow><annotation encoding="TeX">\forall x \in [{-1};1],\;\mathtt{\operatorname{Math.acos}(x)} = \arccos(x) = \text{ the unique } \; y \in [0; \pi] \, \text{such that} \; \cos(y) = x</annotation></semantics></math></p>
-
-<h2 id="Syntax" name="Syntax">Sintaxi</h2>
-
-<pre class="syntaxbox"><code>Math.acos(<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.acos()</code> retorna un valor numèric entre 0 i π radians per a <code>x</code> entre -1 i 1. Si el valor de <code>x</code> està fora d'aquest rang, retorna {{jsxref("NaN")}}.</p>
-
-<p>Degut a que <code>acos()</code> és un mètode estàtic de <code>Math</code>, sempre s'utilitza com a <code>Math.acos()</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.acos" name="Example:_Using_Math.acos">Exemple: Utilitzar <code>Math.acos()</code></h3>
-
-<pre class="brush: js">Math.acos(-2);  // NaN
-Math.acos(-1);  // 3.141592653589793
-Math.acos(0);   // 1.5707963267948966
-Math.acos(0.5); // 1.0471975511965979
-Math.acos(1);   // 0
-Math.acos(2);   // NaN
-</pre>
-
-<p>Per a valors menors que -1 o majors que 1, <code>Math.acos()</code> retorna {{jsxref("NaN")}}.</p>
-
-<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-15.8.2.2', 'Math.acos')}}</td>
-   <td>{{Spec2('ES5.1')}}</td>
-   <td> </td>
-  </tr>
-  <tr>
-   <td>{{SpecName('ES6', '#sec-math.acos', 'Math.acos')}}</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.asin()")}}</li>
- <li>{{jsxref("Math.atan()")}}</li>
- <li>{{jsxref("Math.atan2()")}}</li>
- <li>{{jsxref("Math.cos()")}}</li>
- <li>{{jsxref("Math.sin()")}}</li>
- <li>{{jsxref("Math.tan()")}}</li>
-</ul>