Computes the hyperbolic tangent.
#include <math.h> float tanhf (x) float x; long double tanhl (x) double x; double tanh (x) double x;
The tanhf, tanhl, and tanh subroutines compute the hyperbolic tangent of the x .
An application wishing to check for error situations should set the errno global variable to zero and call feclearexcept(FE_ALL_EXCEPT) before calling these subroutines. Upon return, if errno is nonzero or fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is nonzero, an error has occurred.
| x | Specifies the value to be computed. |
Upon successful completion, the tanhf, tanhl, and tanh subroutines return the hyperbolic tangent of x.
If x is NaN, a NaN is returned.
If x is ±0, x is returned.
If x is ±Inf, ±1 is returned.
If x is subnormal, a range error may occur and x should be returned.
The sin, sinf, or sinl Subroutine.
atanf or atanl Subroutine, feclearexcept Subroutine, fetestexcept Subroutine, and class, _class, finite, isnan, or unordered Subroutines in AIX 5L Version 5.2 Technical Reference: Base Operating System and Extensions Volume 1.
math.h in AIX 5L Version 5.2 Files Reference.