1. The problem statement, all variables and given/known data http://img545.imageshack.us/img545/8149/13862239.png [Broken] The displacement functions: http://img256.imageshack.us/img256/2743/13939694.png [Broken] Derive the displacement functions 2-10 up to 2-13. 2. Relevant equations Third cubic polynomial and elementary beam theory 3. The attempt at a solution I don't understand how the displacement functions can be derived can somebody give me a hint?