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    Command:

    atan2f

    
    
    

    SYNOPSIS

           #include <math.h>
    
           double atan2(double y, double x);
           float atan2f(float y, float x);
           long double atan2l(long double y, long double x);
    
           Link with -lm.
    
       Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
    
           atan2f(), atan2l():
                  _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 ||
                  _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
                  or cc -std=c99
    
    
    

    DESCRIPTION

           The atan2() function calculates the principal value of the arc  tangent
           of  y/x, using the signs of the two arguments to determine the quadrant
           of the result.
    
    
    

    RETURN VALUE

           On success, these functions return the principal value of the arc  tan-
           gent of y/x in radians; the return value is in the range [-pi, pi].
    
           If y is +0 (-0) and x is less than 0, +pi (-pi) is returned.
    
           If y is +0 (-0) and x is greater than 0, +0 (-0) is returned.
    
           If y is less than 0 and x is +0 or -0, -pi/2 is returned.
    
           If y is greater than 0 and x is +0 or -0, pi/2 is returned.
    
           If either x or y is NaN, a NaN is returned.
    
           If y is +0 (-0) and x is -0, +pi (-pi) is returned.
    
           If y is +0 (-0) and x is +0, +0 (-0) is returned.
    
           If  y is a finite value greater (less) than 0, and x is negative infin-
           ity, +pi (-pi) is returned.
    
           If y is a finite value greater (less) than 0, and x is positive  infin-
           ity, +0 (-0) is returned.
    
           If  y  is  positive infinity (negative infinity), and x is finite, pi/2
           (-pi/2) is returned.
    
           If y is positive infinity (negative infinity) and x is negative  infin-
           ity, +3*pi/4 (-3*pi/4) is returned.
    
           If  y is positive infinity (negative infinity) and x is positive infin-
                                      2010-09-20                          ATAN2(3)
    
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