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# StrictMath tanh() Method in Java

• Last Updated : 03 Aug, 2018

The java.lang.StrictMath.tanh() method is used to return the hyperbolic tan of a double value passed as parameter to the function. The hyperbolic tan of x is defined by the formula where e denotes the Euler’s number.

Syntax:

public static double tanh(double x)

Parameters: The function accepts a single parameter x of double type and refers to the value whose hyperbolic tangent equivalence is to be returned.

Return Values: This method returns a double value which is the hyperbolic tangent of x. The absolute value of exact tanh never exceeds 1. The following cases are considered:

• The function returns NaN if the argument is NaN.
• The function returns +1.0 and -1.0 for positive infinity and negative infinity respectively.
• The function returns zero with the same sign as the argument if the argument is zero

Examples:

Input: 0.7853981633974483
Output: 0.6557942026326724

Input: 4.0
Output: 0.999329299739067

Below programs illustrate the java.lang.StrictMath.tanh() method:
Program 1:

 // Java Program to demonstrate tanh()import java.io.*;import java.math.*;import java.lang.*;  class GFG {    public static void main(String[] args)    {          double x = (45 * Math.PI) / 180;          // Display the hyperbolic tan of the value        System.out.println("Hyperbolic tan of "                + x + " = " + StrictMath.tanh(x));    }}
Output:
Hyperbolic tan of 0.7853981633974483 = 0.6557942026326724

Program 2:

 // Java Program to illustrate // StrictMath.tanh() function   import java.io.*;import java.math.*;import java.lang.*;  class GFG {    public static void main(String[] args)    {          double x1 = 180 / (0.0), x2 = 0;          // Display the hyperbolic tan of the values        System.out.println("Hyperbolic tan of "               + x1 + " = " + StrictMath.tanh(x1));        System.out.println("Hyperbolic tan of "               + x2 + " = " + StrictMath.tanh(x2));    }}
Output:
Hyperbolic tan of Infinity = 1.0
Hyperbolic tan of 0.0 = 0.0

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