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ATAN(3)                    Library Functions Manual                    ATAN(3)

NAME
     atan, atanf, atanl -- arc tangent function of one variable

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <math.h>

     double
     atan(double x);

     float
     atanf(float x);

     long double
     atanl(long double x);

DESCRIPTION
     The atan(), atanf(), and atanl() functions compute the principal value of
     the arc tangent of x in the range [-pi/2, +pi/2].

SEE ALSO
     acos(3), asin(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3),
     tan(3), tanh(3)

STANDARDS
     The atan() functions conforms to ISO/IEC 9899:1999 (``ISO C99'').

NetBSD 7.1.2                   January 29, 2013                   NetBSD 7.1.2