3. f-axis 1 The function f, which depends on x and y, is shown on the right as the curved surface common in the three panels. The total differential of f is: plane where y is fixed x-axis Note that this is the same as: Xr+dx y-axis f-axis 4(a) Explain what and a re in words d) y dyx and what they correspond to in the figure. (b) What do ) dx and ( dy correspond y+dy r-axis la dy dy plane where x is fixed y-axis to in the figure? (c) What are the values of f at positions 2 and 4 in the figure? (d) What is the value at position 5 in the figure? f-axis af dx +2x (e) When would df = would df of dy? axl y 5 x x+dx dx x-axis V+dy dy y-axis 1,3 are lines 2,4,5 are points