Find points on the surface x2 + 3y2 + 4z2 - 2.xy = 16 at which the tangent plane is
Chapter 9, Problem 28(choose chapter or problem)
Find points on the surface x2 + 3y2 + 4z2 - 2.xy = 16 at which the tangent plane is parallel to (a) the xz-plane, (b) the yz-plane, and (c) the xy-plane.
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