JavaScript Math cosh()

// hyperbolic cosine of 1
let number = Math.cosh(1);
console.log(number);

// Output: 1.5430806348152437

cosh() Syntax

The syntax of the Math.cosh() method is:

Math.cosh(number)

Here, cosh() is a static method. Hence, we are accessing the method using the class name, Math.

cosh() Parameter

The cosh() method takes a single parameter:

• number - whose hyperbolic cosine is to be calculated

cosh() Return Value

The cosh() method returns:

• hyperbolic cosine of the given argument number
• NaN (Not a Number) for a non-numeric argument

Example1: JavaScript Math.cosh()

// hyperbolic cosine of negative number
let number1 = Math.cosh(-1);
console.log(number1);  

// hyperbolic cosine of zero
let number2 = Math.cosh(0);
console.log(number2); 

// hyperbolic cosine of positive number
let number3 = Math.cosh(2);
console.log(number3);    

// Output:
// 1.5430806348152437
// 1
// 3.7621956910836314

In the above example, the Math.cosh() method computes the hyperbolic cosine of

• -1 (negative number) - results in 1.5430806348152437
• 0 (zero) - results in 1
• 2 (positive number) - results in 3.7621956910836314

Note: Mathematically, the hyperbolic cosine is equivalent to (e^x + e^-x)/2.

Example 2: Math.cosh() with Infinity Values

// cosh() with positive infinity
let number1 = Math.cosh(Infinity);
console.log(number1); 
// Output: Infinity

// cosh() with negative infinity
let number2 = Math.cosh(-Infinity);
console.log(number2); 
// Output: Infinity

Example 3: Math.cosh() with Non-Numeric Argument

let string = "Harry";

// cosh() with a string argument
let value = Math.cosh(string);
console.log(value);   

// Output: NaN

In the above example, we have tried to calculate the hyperbolic cosine value of the string "Harry". That's why we get NaN as the output.

Recommended readings:

• JavaScript Math cos()
• JavaScript Math sinh()
• JavaScript Math tanh()