From da78a9e329e272dedb2400b79a3bdeebff387d47 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:42:17 -0500
Subject: initial commit

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+---
+title: Math.acos()
+slug: Web/JavaScript/Reference/Global_Objects/Math/acos
+translation_of: Web/JavaScript/Reference/Global_Objects/Math/acos
+---
+<div>{{JSRef}}</div>
+
+<p>La funzione <strong><code>Math.acos()</code></strong> ritorna l'arcocoseno (in radianti) di un numero, ovvero</p>
+
+<p><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> the unique </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>such that</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="Sintassi">Sintassi</h2>
+
+<pre class="syntaxbox"><code>Math.acos(<var>x</var>)</code></pre>
+
+<h3 id="Parametri">Parametri</h3>
+
+<dl>
+ <dt><code>x</code></dt>
+ <dd>Un numero.</dd>
+</dl>
+
+<h3 id="Valore_di_ritorno">Valore di ritorno</h3>
+
+<p>L'arcocoseno (in radianti) del numero passato come parametro se quest'ultimo si trova tra i valori <strong>-1</strong> e <strong>1</strong>; altrimenti ritorna {{jsxref("NaN")}}.</p>
+
+<h2 id="Descrizione">Descrizione</h2>
+
+<p>Il metodo <code>Math.acos()</code> ritorna un valore numerico compreso tra 0 and π radianti per <code>x</code> compreso tra -1 e 1. Se il valore di <code>x</code> si trova al di fuori di questo range il metodo ritorna {{jsxref("NaN")}}.</p>
+
+<p>Siccome <code>acos()</code> è un metodo statico di <code>Math</code>, viene sempre usato come <code>Math.acos()</code> piuttosto che come metodo di un oggetto <code>Math</code> creato in precedenza (<code>Math</code> non è un costruttore).</p>
+
+<h2 id="Esempi">Esempi</h2>
+
+<h3 id="Math.acos()"><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 valori inferiori a -1 o maggiori di 1, <code>Math.acos()</code> ritorna {{jsxref("NaN")}}.</p>
+
+<h2 id="Specifiche">Specifiche</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specifica</th>
+   <th scope="col">Stato</th>
+   <th scope="col">Commento</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES1')}}</td>
+   <td>{{Spec2('ES1')}}</td>
+   <td>Definizione iniziale. Implementata in 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>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-math.acos', 'Math.acos')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibilità_dei_Browser">Compatibilità dei Browser</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("javascript.builtins.Math.acos")}}</p>
+
+<h2 id="Vedi_anche">Vedi anche</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>
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