1. Partial Derivatives. For each of the following multi-variable functions, compute the partial derivatives with respect to both x and y. f (x, Y) =27 b. f(x, y) = 2x+3y c. f(x.V)=xy d. f(x.y) = Inx+2ly e. f(x,y) = 2vx + 2,y f. f (x, y) = = V g. f (x,y) = 2