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    Command:

    atanf

    
    
    

    SYNOPSIS

           #include <math.h>
    
           double atan(double x);
           float atanf(float x);
           long double atanl( long double x);
    
           Link with -lm.
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           atanf(), atanl():
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
               _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
               or cc -std=c99
    
    
    

    DESCRIPTION

           The atan() function calculates the principal value of the  arc  tangent
           of x; that is the value whose tangent is x.
    
    
    

    RETURN VALUE

           On  success, these functions return the principal value of the arc tan-
           gent of x in radians; the return value is in the range [-pi/2, pi/2].
    
           If x is a NaN, a NaN is returned.
    
           If x is +0 (-0), +0 (-0) is returned.
    
           If x  is  positive  infinity  (negative  infinity),  +pi/2  (-pi/2)  is
           returned.
    
    
    

    ERRORS

           No errors occur.
    
    
    

    ATTRIBUTES

       Multithreading (see pthreads(7))
           The atan(), atanf(), and atanl() functions are thread-safe.
    
    
    

    CONFORMING TO

           C99, POSIX.1-2001.  The variant returning double also conforms to SVr4,
           4.3BSD, C89.
    
    
    

    SEE ALSO

           acos(3), asin(3), atan2(3), carg(3), catan(3), cos(3), sin(3), tan(3)
    
                                      2013-10-07                           ATAN(3)
    
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