In Problems 33-34, let z = f(x, y). x = x(u, D), y = yu, v) and x(1, 2) = 5, y(1, 2) = 3, calculate the partial derivative in terms of some of the numbers a, b. c, d, e, k. p. q: f(1.2) =a f (1,2)=c x (1,2)=e y (1.2) =p f (5.3) =b f (5,3)=d x (1.2) =k y (1,2) =4 33. z (1, 2)