8. Find fx (x, y, z), fy ( x, y, z), fz ( x, y, z), fxx ( x, y, z), fyy ( x, y, z), fzz ( x, y, z), fxy (x, y, z), fxz (x, y, z), fyz (x, y, z) for the function f (x, y, z) = x3 - y2 + 24 + x3 y2z. 9. Find fx (x, y), fy (x, y), and fx (1,2), fy (1,2) for f (x, y) = 2e3x2-xy