Calculate of/Ox (the partial derivative), of/dy (the partial derivative), and offox / of/dy. (You'll see why we calculate the ratio of the two partial derivatives in the next chapter!) Note, the derivative of In(x) is 1/x 3) Consider the following functions: a f(x.y)=xy. b f(x.y)=x2y2 C) f(x.y)=Inx+Iny d) f(x.y)=x+y+x3y2 e f(x.y)=6x+10y f(x.y)=x0.250.75