Let d be the distance from a point on the plane x - 2y + 3z = 9 to the point (0, 2, 1). For f(x, y) = d², find the following derivatives. fy(X, v) = 2х — 3 2 ( 2y – x +1 4 2у — х 2y – 2+ 3 3 Find the critical point. (х, у) %-

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