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author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:42:52 -0500 |
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committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:42:52 -0500 |
commit | 074785cea106179cb3305637055ab0a009ca74f2 (patch) | |
tree | e6ae371cccd642aa2b67f39752a2cdf1fd4eb040 /files/pt-br/web/javascript/reference/global_objects/math/atan/index.html | |
parent | da78a9e329e272dedb2400b79a3bdeebff387d47 (diff) | |
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diff --git a/files/pt-br/web/javascript/reference/global_objects/math/atan/index.html b/files/pt-br/web/javascript/reference/global_objects/math/atan/index.html new file mode 100644 index 0000000000..91e5b4f52a --- /dev/null +++ b/files/pt-br/web/javascript/reference/global_objects/math/atan/index.html @@ -0,0 +1,104 @@ +--- +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> |