atan(3) - NetBSD Manual Pages

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ATAN(3)                   NetBSD Programmer's Manual                   ATAN(3)


NAME

     atan - arc tangent function of one variable


SYNOPSIS

     #include <math.h>

     double
     atan(double x);

     float
     atanf(float x);


DESCRIPTION

     The atan() and atanf() 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),  sin(3),  sinh(3),
     tan(3),  tanh(3),  math(3)


STANDARDS

     The atan() functions conforms to ANSI X3.159-1989 (``ANSI C'').

4.4BSD                            May 2, 1991                                1