Find an equation of the tangent plane to the surface f(x, y) = xy^-1 at the point (4, 2, 2). -1/2x + y + z = -2 -1/2x - y + z = -2 -1/2x + y + z = 2 -2x + y + z = -4 4x + 2y + 2z = 0
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