c99 [ flag... ] file... -lm [ library... ] #include <math.h>
double tanh(double x);
float tanhf(float x);
long double tanhl(long double x);
These functions compute the hyperbolic tangent of their argument x.
Upon successful completion, these functions return the hyperbolic tangent of x.
If x is NaN, a NaN is returned.
If x is ±0, x is returned.
See attributes(5) for descriptions of the following attributes:
ATTRIBUTE TYPE | ATTRIBUTE VALUE |
Interface Stability | Standard |
MT-Level | MT-Safe |
atanh(3M), isnan(3M), math.h(3HEAD), tan(3M), attributes(5), standards(5)