<TITLE>atan</TITLE> <body bgcolor="#ffffcc"> <hr> <pre> <h3>ATAN(3) Linux Programmer's Manual ATAN(3) </h3> <h3>NAME </h3> atan - arc tangent function <h3>SYNOPSIS </h3> #include <math.h> double atan(double x); <h3>DESCRIPTION </h3> The atan() function calculates the arc tangent of x; that is the value whose tangent is x. <h3>RETURN VALUE </h3> The atan() function returns the arc tangent in radians and the value is mathematically defined to be between -PI/2 and PI/2 (inclusive). <h3>CONFORMING TO </h3> SVID 3, POSIX, BSD 4.3, ISO 9899 </pre> <hr> <h3>SEE ALSO </h3><p> <a href=acos.htm>acos</a>, <a href=asin.htm>asin</a>, <a href=atan2.htm>atan2</a>, <a href=cos.htm>cos</a>, <a href=sin.htm>sin</a>, <a href=tan.htm>tan</a>, <pre> June 8, 1993 1 </pre> <P> <hr> <p> <center> <table border=2 width=80%> <tr align=center> <td width=25%> <a href=../index.htm>Top</a> </td><td width=25%> <a href=../master_index.html>Master Index</a> </td><td width=25%> <a href=../SYNTAX/keywords.html>Keywords</a> </td><td width=25%> <a href=../FUNCTIONS/index.htm>Functions</a> </td> </tr> </table> </center> <p> <hr> This manual page was brought to you by <i>mjl_man V-2.0</i>
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