ii)Derive the following formulas of the Gaussian and Mean Curvature
where and denote the principal vectors
Before I begin I managed to deduce from a previous problem that .
Now I would imagine that since that I would simply have wich would simply give which isn't the desired result.
So looking at both RHS and LHS I think I would get:
then from the RHS I get :
which has lead nowhere.
I'm not looking for the answer, but any hints would be greatly appreciated.