<HTML ><HEAD ><TITLE >cos</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="PHP Manual" HREF="index.html"><LINK REL="UP" TITLE="Mathematical Functions" HREF="ref.math.html"><LINK REL="PREVIOUS" TITLE="ceil" HREF="function.ceil.html"><LINK REL="NEXT" TITLE="cosh" HREF="function.cosh.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=ISO-8859-1"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.ceil.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.cosh.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.cos" ></A >cos</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN44564" ></A ><P > (PHP 3, PHP 4 )</P >cos -- Cosine</DIV ><DIV CLASS="refsect1" ><A NAME="AEN44567" ></A ><H2 >Description</H2 >float <B CLASS="methodname" >cos</B > ( float arg)<BR ></BR ><P > <B CLASS="function" >cos()</B > returns the cosine of the <TT CLASS="parameter" ><I >arg</I ></TT > parameter. The <TT CLASS="parameter" ><I >arg</I ></TT > parameter is in radians. </P ><P > See also <A HREF="function.acos.html" ><B CLASS="function" >acos()</B ></A >, <A HREF="function.sin.html" ><B CLASS="function" >sin()</B ></A > <A HREF="function.tan.html" ><B CLASS="function" >tan()</B ></A > and <A HREF="function.deg2rad.html" ><B CLASS="function" >deg2rad()</B ></A >. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.ceil.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.cosh.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >ceil</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.math.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >cosh</TD ></TR ></TABLE ></DIV ></BODY ></HTML >