NAME    [Toc]    [Back]

     cos, cosf - cosine functions

SYNOPSIS    [Toc]    [Back]

     #include <math.h>

     double
     cos(double x);

     float
     cosf(float x);

DESCRIPTION    [Toc]    [Back]

     The cos() function computes the cosine of x (measured in radians).  The
     cosf()  function  is a single precision version of cos().  A
large magnitude
 argument may yield a result with little or no  significance.  For a
     discussion of error due to roundoff, see math(3).

RETURN VALUES    [Toc]    [Back]

     The cos() and cosf() functions return the cosine value.

SEE ALSO    [Toc]    [Back]

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

STANDARDS    [Toc]    [Back]

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

OpenBSD      3.6                            May      2,      1991