JavaScript Math cosh()

In this tutorial, you will learn about the JavaScript Math.cosh() method with the help of examples.

The cosh() method computes the hyperbolic cosine of the specified number and returns it.


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

// Output: 1.5430806348152437

cosh() Syntax

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


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);
// hyperbolic cosine of zero let number2 = Math.cosh(0);
// 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 (ex + 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.

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