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Posted: **Tue Jun 07, 2022 8:41 am**

: 6 A F X Y X Y Compare Dz And Az When A Changes From 2 To 2 1 And Y Changes From 1 To 1 05 3x Y X Y 0 1 (16.65 KiB) Viewed 59 times

6. (a) f(x, y) = x² + y². Compare dz and Az when a changes from 2 to 2.1 and y changes from 1 to 1.05. 3x²y (x, y) = (0,0) (b) Let f (x, y) = x² + y²¹ Show that fz (0,0) and fy (0,0) both ex- . (x, y) = (0,0) ists, but that f is not differentiable at (0,0).