DragonFly On-Line Manual Pages

ACOS(3)               DragonFly Library Functions Manual               ACOS(3)

NAME
     acos, acosf, acosl -- arc cosine functions

SYNOPSIS
     #include <math.h>

     double
     acos(double x);

     float
     acosf(float x);

     long double
     acosl(long double x);

DESCRIPTION
     The acos() function computes the principal value of the arc cosine of x
     in the range [0, pi].  The acosf() is a single precision version of
     acos().  The acosl() is an extended precision version of acos().

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

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

DragonFly 4.1                    June 5, 2013                    DragonFly 4.1