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

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