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5. Using the ideas from section 14.6, find an equation of the tangent plane to the surface given by xy + yz + zx =5

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5. Using the ideas from section 14.6, find an equation of the tangent plane to the surface given by xy + yz + zx =5 at the point (1, 2, 1) on the surface. 6. Use the second derivatives test to find the local minimum and maximum value(s) and any saddle points of the function: f(x, y) = (x+5)(2y+6)

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