Mathematical Library Functions                            tan(3M)



NAME
     tan, tanf, tanl - tangent function

SYNOPSIS
     c99 [ flag... ] file... -lm [ library... ]
     #include 

     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.

ERORS
     These functions will fail if:

     Domain Error    The value of x is ]Inf.

                     If the integer expression  (matherrhandling
                     &  MATHEREXCEPT)  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 under-
     flow.


     An application wanting to check for exceptions  should  call
     feclearexcept(FEALEXCEPT) before calling these functions.
     On  return,  if  fetestexcept(FEINVALID    FEDIVBYZERO  



SunOS 5.11          Last change: 12 Jul 2006                    1






Mathematical Library Functions                            tan(3M)



     FEOVERFLOW    FEUNDERFLOW)  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.

ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     
           ATRIBUTE TYPE               ATRIBUTE 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          Last change: 12 Jul 2006                    2