(1) Show u belongs to C^1(U), and calculate ux, uy.
(2) Calculate uxx, uyy, uxy and show that uxx and uyy are continuous in the whole disk, but u does not belong to C^2. Calculate f := - delta u.
Please see the attached image for complete question.© BrainMass Inc. brainmass.com June 3, 2020, 12:35 am ad1c9bdddf
Continuous calculations are displayed in the solution.