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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head> <meta name="generator" content= "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org"> <title>cos</title> <link href="../cppreference.css" rel="stylesheet" type="text/css"></head><body><table> <tr> <td> <div class="body-content"> <div class="header-box"> <a href="../index.html">cppreference.com</a> > <a href= "index.html">Standard C Math</a> > <a href="cos.html">cos</a> </div> <div class="name-format"> cos </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <math.h> double cos( double arg );</pre> <p>The cos() function returns the cosine of <em>arg</em>, where <em>arg</em> is expressed in radians. The return value of cos() is in the range [-1,1]. If <em>arg</em> is infinite, cos() will return NAN and raise a floating-point exception.</p> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="acos.html">acos</a><br> <a href="asin.html">asin</a><br> <a href="atan.html">atan</a><br> <a href="atan2.html">atan2</a><br> <a href="cosh.html">cosh</a><br> <a href="sin.html">sin</a><br> <a href="sinh.html">sinh</a><br> <a href="tan.html">tan</a><br> <a href="tanh.html">tanh</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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