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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>A função <strong><code>Math.acos()</code></strong> retorna o arco cosseno (em radianos de um numero, sendo esse</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{ O unico } \; y \in [0; \pi] \, \text{such that} \; \cos(y) = x</annotation></semantics></math></p>
<h2 id="Syntax">Syntax</h2>
<pre class="syntaxbox"><code>Math.acos(<var>x</var>)</code></pre>
<h3 id="Parâmetros"><strong>Parâmetros</strong> </h3>
<dl>
<dd>Um numero.</dd>
</dl>
<h3 id="Retorno">Retorno</h3>
<p>O arco cosseno(em radianos) se o valor passado como parâmetro for entre -1 e 1; caso contrario retornará {{jsxref("NaN")}}.</p>
<h2 id="Description">Description</h2>
<p>O <code>Math.acos()</code> metodo retorna um numero entre 0 e π radians para valores passado como parâmetros entre -1 e 1. Se o valor estiver fora dessa variação será returnado {{jsxref("NaN")}}.</p>
<p>Porque <code>acos() é um metodo estático</code>, você sempre usará <code>Math.acos() ao invés de criar um Objecto Math(Math não é um construtor).</code></p>
<h2 id="Examplos">Examplos</h2>
<h3 id="Usando_Math.acos()">Usando <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>Para valores menores que -1 ou maiores que than 1, <code>Math.acos()</code> o método retornrá {{jsxref("NaN")}}.</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>Initial definition. Implemented 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="Compatibilidade_entre_navegadores">Compatibilidade entre navegadores</h2>
<div>{{CompatibilityTable}}</div>
<div id="compat-desktop">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Chrome for Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
</tr>
</tbody>
</table>
</div>
<h2 id="Veja_também">Veja também</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>
|
