You must have V(S,h).
Eliminate r from V(r,h) using S(r,h).
Compute the following
That is for the first partial derivative hold constant and so on for the other two partial derivatives.
So for the first one, am I suppose to solve in terms of ? I am not sure how to go about computing those partial derivatives. Thank you.
Please solve a quadratic equation or look here
Quadratic equation - Wikipedia, the free encyclopedia