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diff --git a/files/it/web/javascript/reference/global_objects/math/atan/index.html b/files/it/web/javascript/reference/global_objects/math/atan/index.html deleted file mode 100644 index 9be8920214..0000000000 --- a/files/it/web/javascript/reference/global_objects/math/atan/index.html +++ /dev/null @@ -1,100 +0,0 @@ ---- -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> |