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

COS(3)							   BSD Library Functions Manual 						    COS(3)

cos, cosf, cosl -- cosine functions
Math Library (libm, -lm)
#include <math.h> double cos(double x); float cosf(float x); long double cosl(long double x);
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).
The cos(), cosf(), and cosl() functions return the cosine value.
acos(3), asin(3), atan(3), atan2(3), ccos(3), cosh(3), math(3), sin(3), sinh(3), tan(3), tanh(3)
These functions conform to ISO/IEC 9899:1999 (``ISO C99'').
January 24, 2008 BSD
Ken Thompson

Kenneth Lane Thompson is an American computer science legend who was born February 4, 1943 in New Orleans, Louisiana. Ken was one of the key players who designed and implemented the original Unix operating system when he worked at Bell Labs. Ken also invented the B programming language which was the direct predecessor to the C programming language. He was also one of the creators and early developers of the Plan 9 operating system.
Ken has worked at Google since 2006. At Google, he co-invented the Go programming language. In the early days of Unix, he worked on regular expressions and early computer text editors such as QED and ed. His early work on computer chess included the creation of endgame tablebases and the chess machine Belle.
According to a 2009 interview, Ken is a Linux user.
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