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# Java Math.tanh() method

The **java.lang.Math.tanh()** is used to return the hyperbolic tangent of a value. The hyperbolic tangent of any value x can be defined as ((e^{x} â€“ e ^{-x})/2) / ((e^{x} + e ^{-x})/2), where e is an Eulerâ€™s number. We can say that tanh(a) = sinh(a)/cosh(a).

## Syntax

## Parameter

## Return

- If the argument is positive or negative number, this method will return hyperbolic tangent value.
- If the argument is
**Zero**, this method will return**zero**with the same sign as the argument. - If the argument is
**NaN**, this method will return**NaN**. - If the argument is
**Positive Infinity****, this method will return****+1.0**. - If the argument is
**Negative Infinity**, this method will return**-1.0**.

## Example 1

**Output:**

0.9999999999244973

## Example 2

**Output:**

1.0

## Example 3

**Output:**

-0.0

## Example 4

**Output:**

NaN

## Example 5

**Output:**

-1.0

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