.tanh()

The Math.tanh() method returns the hyperbolic sine of a double-type value.

Syntax

Math.tanh(double num)

The .tanh() method takes a single num parameter that represents the angle (given in radians) whose hyperbolic tangent is to be determined. The return type of the .tanh() method is a double.

Some special cases for the .tanh() method include the following:

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

The computed result will be within 2.5 units of least precision (ulps) of the exact result.

Example

The following example demonstrates the application of the .tanh() method:

// Check.java
public class Check {
  public static void main(String args[]) {
    // Value of num in degrees
    double num = 45.0;

    // Convert into radians
    num = Math.toRadians(num);

    // Compute and print hyperbolic tangent
    System.out.println(Math.tanh(num));
  }
}

This results in the following output:

0.6557942026326724