Hyperbolic tangent
[Classification]
Mathematical library
[Syntax]
#include <math.h>
double __far tanh(double x);
[Return value]
Returns the hyperbolic tangent of x.
If the solution is a denormal number, tanh sets macro ERANGE to global variable errno.
[Description]
This function calculates the hyperbolic tangent of x. Specify the angle in radian. The definition expression is as follows.
sinh (x) / cosh (x)