(a) Evaluate (2, 1) and (2.1, 1.05) and calculate z (b) Use the total differential dz to...
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(a) Evaluate ƒ(2, 1) and ƒ(2.1, 1.05) and calculate Δz
(b) Use the total differential dz to approximate Δz.
ƒ(x, y) = x² + y²
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