atanf man page on OpenIndiana

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atan(3M)		Mathematical Library Functions		      atan(3M)

NAME
       atan, atanf, atanl - arc tangent function

SYNOPSIS
       c99 [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double atan(double x);

       float atanf(float x);

       long double atanl(long double x);

DESCRIPTION
       These functions compute the principal value of the arc tangent of x.

RETURN VALUES
       Upon successful completion, these functions return the arc tangent of x
       in the range [−pi/2,pi/2] radians.

       If x is NaN, NaN is returned.

       If x is ±0, x is returned.

       If x is ±Inf, ±pi/2 is returned.

ERRORS
       No errors are defined.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Committed			   │
       ├─────────────────────────────┼─────────────────────────────┤
       │MT-Level		     │MT-Safe			   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Standard		     │See standards(5).		   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       atan2(3M),  isnan(3M),  math.h(3HEAD),  tan(3M),	 attributes(5),	 stan‐
       dards(5)

SunOS 5.11			  12 Jul 2006			      atan(3M)
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