DragonFly On-Line Manual Pages


COS(3)		      DragonFly Library Functions Manual		COS(3)

NAME

cos, cosf, cosl -- cosine functions

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(), cosf(), and cosl() functions return the cosine value.

SEE ALSO

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

STANDARDS

These functions conform to ISO/IEC 9899:1999 (``ISO C99''). DragonFly 3.9 December 21, 2011 DragonFly 3.9