1. For the function f(x, y) = In root (2 + xy), find the equation of the tangent plane at the point (1, 3, 1) on the graph of z = f(x, y) Ciricle pls! and then use linear approximation to estimate the change in f(x, y) as (x, y) varies from (1, 3) to (-0.05, 1.50)

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