Question: Show that the function is differentiable by finding values of 1 and 2 as designated in the definition of differentiability, and verify that

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 - 2x + y

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