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1. a) For the surface f(x, y, z) = xy + yz + xz = 3,...

1. a) For the surface f(x, y, z) = xy + yz + xz = 3, find the equation of the tangent plane at (1, 1, 1).

b) For the surface f(x, y, z) = xy + yz + xz = 3, find the equation of the normal line to the surface at (1, 1, 1).

Math   Calculus   
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