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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:42:52 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:42:52 -0500
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+---
+title: Math.atan()
+slug: Web/JavaScript/Reference/Global_Objects/Math/atan
+tags:
+ - JavaScript
+ - Math
+ - Method
+ - Reference
+ - Referencia
+ - metodo
+translation_of: Web/JavaScript/Reference/Global_Objects/Math/atan
+---
+<div>{{JSRef}}</div>
+
+<p>A função <strong><code>Math.atan()</code></strong> retorna a arco tangente (em radianos) de um número, onde</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> the unique </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>such that</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="Sintaxe">Sintaxe</h2>
+
+<pre class="syntaxbox"><code>Math.atan(<var>x</var>)</code></pre>
+
+<h3 id="Parâmetros">Parâmetros</h3>
+
+<dl>
+ <dt><code>x</code></dt>
+ <dd>Um número.</dd>
+</dl>
+
+<h3 id="Valor_retornado">Valor retornado</h3>
+
+<p>O arco tangente (em radianos) do parâmetro recebido.</p>
+
+<h2 id="Descrição">Descrição</h2>
+
+<p>O método <code>Math.atan()</code> retorna um valor numérico entre <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> radianos.</p>
+
+<p>Por <code>atan()</code> ser um método estático de <code>Math</code>, deve-se sempre usá-lo como <code>Math.atan()</code>, e não como um método de um objeto <code>Math</code> que você criou.</p>
+
+<h2 id="Exemplos">Exemplos</h2>
+
+<h3 id="Usando_Math.atan()">Usando <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>// The angle that the line [(0,0);(x,y)] forms with the x-axis in a Cartesian coordinate system
+Math.atan(y / x);
+</pre>
+
+<p>Talvez você queira evitar usar <strong>±</strong><code>Infinity</code> por motivos estéticos. Nesse caso, {{jsxref("Math.atan2()")}} com <code>0</code> como segundo parâmentro pode ser uma solução melhor.</p>
+
+<h2 id="Especificações">Especificações</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Specification</th>
+ <th scope="col">Status</th>
+ <th scope="col">Comment</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('ES1')}}</td>
+ <td>{{Spec2('ES1')}}</td>
+ <td>Definição inicial. Implementado em 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="Compatibilidade_nos_navegadores">Compatibilidade nos navegadores</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="Veja_também">Veja também</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>