I have used maple to solve numerically the biharmonic equation. $$\Delta^{2} h(r)=0$$ and then i added an external potential so it became like this $$\Delta^{2} h(r) + c\cdot h(r)=0$$ where c is a giving constant now i want to generalize the form of h(r). So i want to add $$V(h(r))$$ which is a general function of the height field $$h(r)$$ so now i want to solve this $$\Delta^{2} h(r) + V^{'}(h(r))=0$$ where i added the derivative of V.
How can i write in maple? $$V^{'}(h(r))$$