opensolaris man page for tan

tan(3M) 						  Mathematical Library Functions						   tan(3M)

NAME
       tan, tanf, tanl - tangent function

SYNOPSIS
       c99 [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double tan(double x);

       float tanf(float x);

       long double tanl(long double x);

DESCRIPTION
       These functions compute the tangent of their argument x, measured in radians.

RETURN VALUES
       Upon successful completion, these functions return the tangent of x.

       If x is NaN, a NaN is returned.

       If x is +-0, x is returned.

       If x is +-Inf, a domain error occurs and a NaN is returned.

ERRORS
       These functions will fail if:

       Domain Error    The value of x is +-Inf.

		       If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, the invalid floating-point exception is raised.

USAGE
       There are no known floating-point representations such that for a normal argument, tan(x) is either overflow or underflow.

       An  application	wanting  to  check  for  exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if
       fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception  has  been  raised.  An  application  should
       either examine the return value or check the floating point exception flags to detect exceptions.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       atan(3M), feclearexcept(3M), fetestexcept(3M), isnan(3M), math.h(3HEAD), attributes(5), standards(5)

SunOS 5.11							    12 Jul 2006 							   tan(3M)