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If z = x2 − xy + 4y2 and (x, y) changes from (1, −1) to...

If z = x2 − xy + 4y2 and (x, y) changes from (1, −1) to (0.96, −0.95), compare the values of Δz and dz. (Round your answers to four decimal places.) dz = , Δz =

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