Show directly, as in Exercise 43, that (x, y) = xy 2 is differentiable at (0, 2).
Question:
Show directly, as in Exercise 43, that ƒ(x, y) = xy2 is differentiable at (0, 2).
Data From Exercise 43
This exercise shows directly (without using Theorem 1) that the function ƒ(x, y) = 5x + 4y2 from Example 1 is differentiable at (a, b) = (2, 1).
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