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Compute the normal vector at (3,8)(3,8) and use it to estimate the area of the small...

Compute the normal vector at (3,8)(3,8) and use it to estimate the area of the small patch of the surface
Φ(u,v)=(u2−v2,u+v,u−v)Φ(u,v)=(u2−v2,u+v,u−v) defined by

3≤u≤3.8,8≤v≤8.1

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