Java Math tanh() method with Examples

The java.lang.Math.tanh() returns the hyperbolic tangent of a double value passed to it as argument. The hyperbolic tangent of any value a is defined as,

((e^a – e^-a)/2)/((e^a + e^-a)/2)

where e is Euler’s number. In other words, we can say that tanh(a) = sinh(a)/cosh(a).

If the argument is NaN, then the result is NaN. If the argument is positive infinity then the result will be +1.0. If the argument is negative infinity then the result will be -1.0. If the argument is zero, then the result is zero with the same sign as that of the argument a.

Syntax :

public static double tanh(double a)
Parameter :
a : the value whose hyperbolic tangent is to be returned.

Return :
This method returns the hyperbolic tangent value of the argument.

Example 1 : To show working of java.lang.Math.tanh() method.

// Java program to demonstrate working
// of java.lang.Math.tanh() method
import java.lang.Math;

class Gfg {

    // driver code
    public static void main(String args[])
    {

        double a = 3.5;

        System.out.println(Math.tanh(a));

        a = 90.328;

        System.out.println(Math.tanh(a));

        a = 0;
        // argument is zero, output will also be 0
        System.out.println(Math.tanh(a));
    }
}

Output:

0.9981778976111987
1.0
0.0

Example 2 : To show working of java.lang.Math.tanh() method when argument is NaN or infinity.

// Java program to demonstrate working
// of java.lang.Math.tanh() method infinity case
import java.lang.Math; // importing java.lang package

public class GFG {
    public static void main(String[] args)
    {

        double positiveInfinity =
               Double.POSITIVE_INFINITY;
        double negativeInfinity =
               Double.NEGATIVE_INFINITY;
        double nan = Double.NaN;
        double result;

        // Here argument is negative infinity
        result = Math.tanh(negativeInfinity);
        System.out.println(result);

        // Here argument is positive infinity
        result = Math.tanh(positiveInfinity);
        System.out.println(result);

        // Here argument is NaN, output will be NaN
        result = Math.tanh(nan);
        System.out.println(result);
    }
}

Output:

-1.0
1.0
NaN