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Let f be a function defined by z = f(@, y) = 3xy - 4y. (1) Find the total differential of f at (-1, 3).

Let f be a function defined by z = f(@, y) = 3xy - 4y. (1) Find the total differential of f at (-1, 3). The answer is dz = dy . (2) Find the approximate change in z when za changes from x = -1tox = 98 100 and from y = 3 to y = 301 100 The answer is

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