prove jordan's inequality using calculus

buy me a coffee: https://www.buymeacoffee.com/mathphytcs

Donate to Channel(斗內一下): https://paypal.me/kuoenjui Facebook: https://www.facebook.com/mathenjui Instagram: https://www.instagram.com/mathphyen/ ... https://www.youtube.com/watch?v=5r2i-_Lxo1g