1ATAN(3)                    Linux Programmer's Manual                   ATAN(3)
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NAME

6       atan, atanf, atanl - arc tangent function
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SYNOPSIS

9       #include <math.h>
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11       double atan(double x);
12       float atanf(float x);
13       long double atanl( long double x);
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15       Link with -lm.
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DESCRIPTION

18       The  atan() function calculates the arc tangent of x; that is the value
19       whose tangent is x.
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RETURN VALUE

22       The atan() function returns the arc tangent in radians and the value is
23       mathematically defined to be between -PI/2 and PI/2 (inclusive).
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CONFORMING TO

26       SVr4,  POSIX.1-2001,  4.3BSD,  C89.  The float and long double variants
27       are C99 requirements.
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SEE ALSO

30       acos(3), asin(3), atan2(3), carg(3), catan(3), cos(3), sin(3), tan(3)
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34                                  2002-07-27                           ATAN(3)
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