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----
-title: Math.acosh()
-slug: Web/JavaScript/Reference/Global_Objects/Math/acosh
-translation_of: Web/JavaScript/Reference/Global_Objects/Math/acosh
-original_slug: Web/JavaScript/Referencia/Objectes_globals/Math/acosh
----
-<div>{{JSRef}}</div>
-
-<p>La funció <strong><code>Math.acosh()</code></strong> retorna l'accosinus hiperbòlic d'un nombre, és a dir</p>
-
-<p><math display="block"><semantics><mrow><mo>∀</mo><mi>x</mi><mo>≥</mo><mn>1</mn><mo>,</mo><mstyle mathvariant="monospace"><mrow><mo lspace="0em" rspace="thinmathspace">Math.acosh</mo><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo></mrow></mstyle><mo>=</mo><mo lspace="0em" rspace="thinmathspace">arcosh</mo><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo><mo>=</mo><mtext> l'única </mtext><mspace width="thickmathspace"></mspace><mi>y</mi><mo>≥</mo><mn>0</mn><mspace width="thickmathspace"></mspace><mtext>tal que</mtext><mspace width="thickmathspace"></mspace><mo lspace="0em" rspace="0em">cosh</mo><mo stretchy="false">(</mo><mi>y</mi><mo stretchy="false">)</mo><mo>=</mo><mi>x</mi></mrow><annotation encoding="TeX">\forall x \geq 1, \mathtt{\operatorname{Math.acosh}(x)} = \operatorname{arcosh}(x) = \text{ the unique } \; y \geq 0 \; \text{such that} \; \cosh(y) = x</annotation></semantics></math></p>
-
-<h2 id="Sintaxi">Sintaxi</h2>
-
-<pre class="syntaxbox"><code>Math.acosh(<var>x</var>)</code></pre>
-
-<h3 id="Paràmetres">Paràmetres</h3>
-
-<dl>
- <dt><code>x</code></dt>
- <dd>Un nombre.</dd>
-</dl>
-
-<h2 id="Descripció">Descripció</h2>
-
-<p>Com que que <code>acosh()</code> és un mètode estàtic de <code>Math</code>, sempre s'utilitza com a <code>Math.acosh()</code>, en comptes de com a mètode d'una instància de <code>Math</code> (<code>Math</code> no és un constructor).</p>
-
-<h2 id="Exemples">Exemples</h2>
-
-<h3 id="Utilitzar_Math.acosh()">Utilitzar <code>Math.acosh()</code></h3>
-
-<pre class="brush: js">Math.acosh(-1); // NaN
-Math.acosh(0);  // NaN
-Math.acosh(0.5) // NaN
-Math.acosh(1);  // 0
-Math.acosh(2);  // 1.3169578969248166
-</pre>
-
-<p><code>Math.acosh()</code> retorna {{jsxref("NaN")}} per a valors menors que 1.</p>
-
-<h2 id="Polyfill">Polyfill</h2>
-
-<p>Per a tot <math><semantics><mrow><mi>x</mi><mo>≥</mo><mn>1</mn></mrow><annotation encoding="TeX">x \geq 1</annotation></semantics></math>, tenim que <math><semantics><mrow><mo lspace="0em" rspace="thinmathspace">arcosh</mo><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo><mo>=</mo><mo lspace="0em" rspace="0em">ln</mo><mrow><mo>(</mo><mrow><mi>x</mi><mo>+</mo><msqrt><mrow><msup><mi>x</mi><mn>2</mn></msup><mo>-</mo><mn>1</mn></mrow></msqrt></mrow><mo>)</mo></mrow></mrow><annotation encoding="TeX">\operatorname {arcosh} (x) = \ln \left(x + \sqrt{x^{2} - 1} \right)</annotation></semantics></math> i, per tant, es pot emular mitjançant la funció següent:</p>
-
-<pre class="brush: js">Math.acosh = Math.acosh || function(x) {
-  return Math.log(x + Math.sqrt(x * x - 1));
-};
-</pre>
-
-<h2 id="Especificacions">Especificacions</h2>
-
-<table class="standard-table">
- <tbody>
-  <tr>
-   <th scope="col">Especificacions</th>
-   <th scope="col">Estat</th>
-   <th scope="col">Comentaris</th>
-  </tr>
-  <tr>
-   <td>{{SpecName('ES6', '#sec-math.acosh', 'Math.acosh')}}</td>
-   <td>{{Spec2('ES6')}}</td>
-   <td>Definició inicial.</td>
-  </tr>
- </tbody>
-</table>
-
-<h2 id="Compatibilitat_amb_navegadors">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>{{CompatChrome("38")}}</td>
-   <td>{{CompatGeckoDesktop("25")}}</td>
-   <td>{{CompatNo}}</td>
-   <td>{{CompatOpera("25")}}</td>
-   <td>{{CompatSafari("7.1")}}</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>{{CompatNo}}</td>
-   <td>{{CompatNo}}</td>
-   <td>{{CompatGeckoMobile("25")}}</td>
-   <td>{{CompatNo}}</td>
-   <td>{{CompatNo}}</td>
-   <td>8</td>
-  </tr>
- </tbody>
-</table>
-</div>
-
-<h2 id="Vegeu_també">Vegeu també</h2>
-
-<ul>
- <li>{{jsxref("Math.asinh()")}} {{experimental_inline}}</li>
- <li>{{jsxref("Math.atanh()")}} {{experimental_inline}}</li>
- <li>{{jsxref("Math.cosh()")}} {{experimental_inline}}</li>
- <li>{{jsxref("Math.sinh()")}} {{experimental_inline}}</li>
- <li>{{jsxref("Math.tanh()")}} {{experimental_inline}}</li>
-</ul>