freebsd man page for tan

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