Updated: 2021/Apr/14

COS(3)                     Library Functions Manual                     COS(3)

NAME
     cos, cosf, cosl - cosine function

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <math.h>

     double
     cos(double x);

     float
     cosf(float x);

     long double
     cosl(long double x);

DESCRIPTION
     The cos(), cosf(), and cosl() functions compute the cosine of x (measured
     in radians).  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
     The cos() function returns the cosine value.

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

STANDARDS
     The cos() function conforms to ANSI X3.159-1989 ("ANSI C89").

HISTORY
     A cos() function appeared in Version 1 AT&T UNIX.

NetBSD 9.99                    September 2, 2019                   NetBSD 9.99