Note
Access to this page requires authorization. You can try signing in or changing directories.
Access to this page requires authorization. You can try changing directories.
Calculate the tangent (tan) or hyperbolic tangent (tanh).
doubletan(doublex**);**
doubletanh(doublex**);**
| Routine | Required Header | Compatibility |
| tan | <math.h> | ANSI, Win 95, Win NT |
| tanh | <math.h> | ANSI, Win 95, Win NT |
For additional compatibility information, see Compatibility in the Introduction.
Libraries
| LIBC.LIB | Single thread static library, retail version |
| LIBCMT.LIB | Multithread static library, retail version |
| MSVCRT.LIB | Import library for MSVCRT.DLL, retail version |
Return Value
tan returns the tangent of x. If x is greater than or equal to 263, or less than or equal to –263, a loss of significance in the result occurs, in which case the function generates a _TLOSS error and returns an indefinite (same as a quiet NaN). You can modify error handling with _matherr.
tanh returns the hyperbolic tangent of x. There is no error return.
Parameter
x
Angle in radians
Example
/* TAN.C: This program displays the tangent of pi / 4
* and the hyperbolic tangent of the result.
*/
#include <math.h>
#include <stdio.h>
void main( void )
{
double pi = 3.1415926535;
double x, y;
x = tan( pi / 4 );
y = tanh( x );
printf( "tan( %f ) = %f\n", pi/4, x );
printf( "tanh( %f ) = %f\n", x, y );
}
Output
tan( 0.785398 ) = 1.000000
tanh( 1.000000 ) = 0.761594