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+---
+title: Math.atan()
+slug: Web/JavaScript/Reference/Global_Objects/Math/atan
+translation_of: Web/JavaScript/Reference/Global_Objects/Math/atan
+---
+<div>{{JSRef}}</div>
+
+<p>La funzione <strong><code>Math.atan()</code></strong> restituisce l'arcotangente (in radianti) di un numero, definita come</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'unica </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><mtext>tale che</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="Sintassi">Sintassi</h2>
+
+<pre class="syntaxbox"><code>Math.atan(<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'arcotangente (in radianti) del numero dato <strong><code>x</code></strong>.</p>
+
+<h2 id="Descrizione">Descrizione</h2>
+
+<p>Il metodo <code>Math.atan()</code> ritorna un valore numerico compreso tra <math><semantics><mrow><mo>-</mo><mfrac><mi>π</mi><mn>2</mn></mfrac></mrow><annotation encoding="TeX">-\frac{\pi}{2}</annotation></semantics></math> e <math><semantics><mfrac><mi>π</mi><mn>2</mn></mfrac><annotation encoding="TeX">\frac{\pi}{2}</annotation></semantics></math> radianti.</p>
+
+<p>Poiché <code>atan()</code> è un membro statico di <code>Math</code>, è da usarsi sempre nella forma <code>Math.atan()</code>, piuttosto che come un metodo di un oggetto <code>Math</code> creato (<code>Math</code> non è il costruttore di una classe).</p>
+
+<h2 id="Esempî">Esempî</h2>
+
+<h3 id="Using_Math.atan()">Using <code>Math.atan()</code></h3>
+
+<pre class="brush: js">Math.atan(1);   // 0.7853981633974483
+Math.atan(0);   // 0
+Math.atan(-0);  // -0
+
+Math.atan(Infinity); <span class="objectBox objectBox-number">  //  1.5707963267948966
+Math.atan(-Infinity);  // -1.5707963267948966
+
+</span>/*
+L'angolo che la retta su cui giace il segmento [(0,0);(x,y)]
+forma con l'asse x di un sistema a coordinate cartesiane
+*/
+Math.atan(y / x);
+</pre>
+
+<p>Note that you may want to avoid using <strong>±</strong><code>Infinity</code> for stylistic reasons. In this case, {{jsxref("Math.atan2()")}} with <code>0</code> as the second argument may be a better solution.</p>
+
+<h2 id="Specifiche">Specifiche</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specifica</th>
+   <th scope="col">Status</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-15.8.2.4', '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>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-math.atan', 'Math.atan')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibilità_con_i_browser">Compatibilità con i 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.atan")}}</p>
+
+<h2 id="Vedere_anche">Vedere anche</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>