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,
((ea – e-a)/2)/((ea + 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));
}
} |
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);
}
} |
-1.0 1.0 NaN