Consider the following. (Round your answers to four decimal places.) f(x, y) = x cos(y) (a) Find f(3, 2) and f(3.1, 2.05) and calculate Az. f(3, 2) = X f(3.1, 2.05) = Δz : = (b) Use the total differential dz to approximate Az. dz = selon chall 2

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