fx fy fxx хх fyy fxy uestions are not related. 1. The diagram below shows level curves of the function z=f(x,y) spaced at z=2. Use the diagram to determine the sign (positive, negative, or zero) of each of the following partial derivatives at the point A. -0.5 -1 1.5 -2.5 10 42 20 8 24 -3 4 3.5 -3 25 2 15 K T