You are walking on the surface given by Q(x,y) = y sin( pi x) - xsin( pi y). From the point . what x.y-direction should you follow to go up the fastest ? Find an x.y-direction from that will keep you at the same level. Explain! What slope will you encounter as you set off from towards ? Find two x.y-directions from (2,1) so that you will encounter a slope of pi as you begin walking.