The Hardest Exam Question in A Level Maths imo

Edexcel A Level Maths. Modelling using Differential Equations. Modelling using Differential Equations Video - https://youtu.be/6--8N7Y4Y9s Solving Differential Equations Video - https://youtu.be/bpyceEsXqJ8 Edexcel AS and A Level Maths Playlist: https://www.youtube.com/playlist?list=PLOKIgpFZAnpCPTeyv3yYGbaMI9uNEnbLY Twitter: https://mobile.twitter.com/GCSEALevStudent