public static native double tanh (double x)

Returns the hyperbolic tangent of a ` double`

value.
The hyperbolic tangent of *x* is defined to be
(*e ^{x} - e^{-x}*)/(

Special cases:

- If the argument is NaN, then the result is NaN.
- If the argument is zero, then the result is a zero with the same sign as the argument.
- If the argument is positive infinity, then the result is
`+1.0`

. - If the argument is negative infinity, then the result is
`-1.0`

.

`x` | The number whose hyperbolic tangent is to be returned. |

` x`

.

Diagram: Math