(a) Find an equation of the tangent plane to the surface at the given point. xyz = 12, (1, 4, 3) (b) Find a set of symmetric equations for the normal line to the surface at the given point. O x + 1 _ y + 4 z + 3 12 3 4 OX + 1 12 y + 4 z + 3 4 OX-1 12 Ox - 1 = y - 4 = z - 3 y - 4 3. Z - 3 4 II N

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