Compute Hyperbolic Cosine

console.log(Math.cosh(0));
// expected output: 1

console.log(Math.cosh(1));
// expected output: 1.543080634815244 (approximately)

console.log(Math.cosh(-1));
// expected output: 1.543080634815244 (approximately)

console.log(Math.cosh(2));
// expected output: 3.7621956910836314

Math.cosh(0);  // 1
Math.cosh(1);  // 1.5430806348152437
Math.cosh(-1); // 1.5430806348152437