acos(3) - NetBSD Manual Pages

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


NAME

     acos - arc cosine function


SYNOPSIS

     #include <math.h>

     double
     acos(double x);

     float
     acosf(float x);


DESCRIPTION

     The acos() and acosf() functions compute the principal value of the arc
     cosine of x in the range [0, pi].


RETURN VALUES

     If |x|>1, acos(x) and acosf(x) set the global variable errno to EDOM.


SEE ALSO

     sin(3),  cos(3),  tan(3),  asin(3),  atan(3),  atan2(3),  sinh(3),
     cosh(3),  tanh(3),  math(3)


STANDARDS

     The acos() function conforms to ANSI X3.159-1989 (``ANSI C'').

4.4BSD                            May 2, 1991                                1