Geometric proof of derivative of cos x › Forums › Calculus › Geometric proof of derivative of cos x This topic has 0 replies, 1 voice, and was last updated 9 months, 1 week ago by Rajeev Bagra. Viewing 1 post (of 1 total) Author Posts March 5, 2025 at 8:35 am #1881 Rajeev BagraParticipant https://www.freemathhelp.com/forum/threads/geometric-proof-of-derivative-of-cos-x.139450/#post-599273 Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In