Cos rule proof grade 11: Obtuse angled triangle

#RoadTo50k Cos rule proof grade 11: Obtuse angled triangle link to Instagram account: https://www.instagram.com/distancelea... Please make sure you like the video, you subscribe and you share the channel with your friends. Thank you for watching guys see you on my next upload. Link to my music channel: https://www.youtube.com/@SoulSessionsWithLee Links to playlists: ********************Pure Mathematics**************************** Pure Mathematics paper 1 past papers: https://www.youtube.com/watch?v=EYez6tsjQkI&list=PLrYbkqr3qrA65h8nGr8FVPp2OUXAHgVMY Analytical geometry playlist: https://www.youtube.com/watch?v=qrAxOI3qYHw&list=PLrYbkqr3qrA5iD3FJMULo08RQ_EoAAnhg Euclidean geometry playlist: https://www.youtube.com/watch?v=6uOb5KIscHU&list=PLrYbkqr3qrA5IQ9O3O4d12DbJxWc_icbO Functions playlist: https://www.youtube.com/watch?v=x1pC4EVfSgs&list=PLrYbkqr3qrA5xmmGby7TQEsLnSLYGYRMD Sequences and series playlist: https://www.youtube.com/watch?v=EvopH34YdMw&list=PLrYbkqr3qrA7ojJtQ6fki43cPDB7XaYoe Trigonometry playlist: https://www.youtube.com/watch?v=BaptWw9bhlE&list=PLrYbkqr3qrA6iuYwh8oZdSsLRqFxfv4jz ********************Mathematics literacy************************** Grade 12 Mathematics literacy curriculum playlist: https://www.youtube.com/watch?v=Cwnh_k83UsE&list=PLrYbkqr3qrA6L4Tf5JoLrgfkS9y-K4WXX Mathematics literacy paper 1 past papers playlist: https://www.youtube.com/watch?v=T5DeeWYxY5c&list=PLrYbkqr3qrA53NuYYi2Absao0RQBC-jZV Mathematics literacy paper 2 past papers playlist: https://www.youtube.com/watch?v=qqdQKzPyGTo&list=PLrYbkqr3qrA6M5EGUQuccPpi1Dfn7zs7P