In Problems 9-12, use the total differential dz to approximate the change in z as (x, y)

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In Problems 9-12, use the total differential dz to approximate the change in z as (x, y) moves from P to Q. Then use a calculator to find the corresponding exact change (z (to the accuracy of your calculator). See Example 3.
Let z = ((x, y) = 2x3 + xy - y3.Compute (z and dz as (x, y) changes from (2, 1) to (2.03, 0.98).
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Calculus

ISBN: 978-0131429246

9th edition

Authors: Dale Varberg, Edwin J. Purcell, Steven E. Rigdon

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