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ACOS(3)                    Library Functions Manual                    ACOS(3)

NAME
     acos, acosf, acosl -- arc cosine function

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <math.h>

     double
     acos(double x);

     float
     acosf(float x);

     long double
     acosl(long double x);

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

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), math(3), sin(3), sinh(3),
     tan(3), tanh(3)

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

NetBSD 7.1.2                   January 29, 2013                   NetBSD 7.1.2