ACOS(3)                 System Library Functions Manual                ACOS(3)

NAME
     acos, acosf - arc cosine functions

SYNOPSIS
     #include 

     double
     acos(double x);

     float
     acosf(float 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().

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

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

Interix                           May 31 2007                          Interix