Show that the function is differentiable by finding values of 1 and 2 as designated
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Show that the function is differentiable by finding values of ε1 and ε2 as designated in the definition of differentiability, and verify that both ε1 and ε2 approach 0 as (Δx, Δy) → (0, 0).
ƒ(x, y) = x² + y²
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