I don't have a problem with anyone here, and I did not downvote your comment to make you feel annoyed. The video you shared here helped solve my math problem, and I did not look into your answer until now. I don't always give my comments or questions in return because I don't need further help with my math problem. I'm very sorry if I made you mad today, and it seems it's already too late as all of my past posts have been downvoted to negative again, and I don't know if I can get help again.