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The tangent plane at (1,1,1) on the surface x2+y2+z2+xy+xz=5 is given by x+   y+ z=   (all values...

The tangent plane at (1,1,1) on the surface x2+y2+z2+xy+xz=5 is given by

x+   y+ z=  

(all values should be positive whole numbers with no common factors)

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