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FreeBSD 11.0 - man page for cos (freebsd section 3)

COS(3)							   BSD 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'').
BSD
January 24, 2008 BSD