<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >acos</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="Manual do PHP" HREF="index.html"><LINK REL="UP" TITLE="Matemática e Trigonometria" HREF="ref.math.html"><LINK REL="PREVIOUS" TITLE="abs" HREF="function.abs.html"><LINK REL="NEXT" TITLE="acosh" HREF="function.acosh.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></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" >Manual do PHP</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.abs.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.acosh.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.acos" ></A >acos</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN104335" ></A ><P > (PHP 3, PHP 4, PHP 5)</P >acos -- Cosseno Inverso (arco cosseno)</DIV ><DIV CLASS="refsect1" ><A NAME="AEN104338" ></A ><H2 >Descrição</H2 >float <B CLASS="methodname" >acos</B > ( float arg )<BR ></BR ><P > Retorna o inverso do coseno de <CODE CLASS="parameter" >arg</CODE > em radianos. <B CLASS="function" >acos()</B > é a função complementar de <A HREF="function.cos.html" ><B CLASS="function" >cos()</B ></A >, o que significa que <TT CLASS="literal" >a==cos(acos(a))</TT > para qualquer valor de var que esteja dentro dos limites de <B CLASS="function" >acos()</B >. </P ><P > Veja também <A HREF="function.acosh.html" ><B CLASS="function" >acosh()</B ></A >, <A HREF="function.asin.html" ><B CLASS="function" >asin()</B ></A > e <A HREF="function.atan.html" ><B CLASS="function" >atan()</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.abs.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Principal</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.acosh.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >abs</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.math.html" ACCESSKEY="U" >Acima</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >acosh</TD ></TR ></TABLE ></DIV ></BODY ></HTML >