tan, tanf, tanh, tanhf
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tan, tanf, tanh, tanhf

Calculate the tangent (tan or tanf) or hyperbolic tangent (tanh or tanhf).

double tan(
   double x 
float tan(
   float x 
);  // C++ only
long double tan(
   long double x
);  // C++ only
float tanf(
   float x 
double tanh(
   double x 
float tanh(
   float x 
);  // C++ only
long double tanh(
   long double x
);  // C++ only
float tanhf(
   float x 


Angle in radians.

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.

Input SEH Exception Matherr Exception
± ∞
(tan, tanf)

tanh returns the hyperbolic tangent of x. There is no error return.


C++ allows overloading, so users can call overloads of tan and tanh that take float or long double types. In a C program, the tan and tanh functions always take and return double.


Routine Required header Compatibility
tan, tanf, tanh, tanhf <math.h> ANSI, Win 98, Win Me, Win NT, Win 2000, Win XP

For additional compatibility information, see Compatibility in the Introduction.


All versions of the C run-time libraries.


// crt_tan.c
/* This program displays the tangent of pi / 4
 * and the hyperbolic tangent of the result.

#include <math.h>
#include <stdio.h>

int 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 );


tan( 0.785398 ) = 1.000000
tanh( 1.000000 ) = 0.761594

See Also

Floating-Point Support Routines | Long Double Routines | acos | asin | atan | cos | sin | Run-Time Routines and .NET Framework Equivalents

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