Question: (a) If z = f(x, y) = x 2 + 3xy y 2 , find the differential dz. (b) If x changes from 2

(a) If z = f(x, y) = x2 + 3xy – y2, find the differential dz. 

(b) If x changes from 2 to 2.05 and y changes from 3 to 2.96, compare the values of Δz and dz.

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