calculus.js

const execute = (num) => {
    let result = 0;
    for (let i = Math.pow(num, 7); i >= 0; i--) {
        result += Math.atan(i) * Math.tan(i);
    }
    return result;
}

module.exports = {
    execute
}

Related to medium article: https://gae-piaz.medium.com/achieve-the-best-performance-10x-faster-node-js-with-worker-threads-97fc2890e40f