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

TAN(3)							   BSD Library Functions Manual 						    TAN(3)

NAME
tan, tanf, tanl -- tangent functions
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h> double tan(double x); float tanf(float x); long double tanl(long double x);
DESCRIPTION
The tan(), tanf(), and tanl() functions compute the tangent 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 tan(), tanf(), and tanl() functions return the tangent value.
SEE ALSO
acos(3), asin(3), atan(3), atan2(3), cos(3), cosh(3), ctan(3), math(3), sin(3), sinh(3), tanh(3)
STANDARDS
These functions conform to ISO/IEC 9899:1999 (``ISO C99'').
BSD
January 24, 2008 BSD

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