1.

Find a unit vector normal to the surface of the ellipsoid at (2,2,1) if the ellipsoid is defined as f(x,y,z) = x2 + y2 + z2 10.

A. ( frac{2}{3} a_x + frac{2}{3} a_y + frac{1}{3} a_z )
B. ( frac{1}{3} a_x + frac{1}{3} a_y + frac{1}{3} a_z )
C. ( frac{2}{3} a_x + frac{2}{3} a_y + frac{2}{3} a_z )
D. ( frac{2}{3} a_x + frac{1}{3} a_y + frac{1}{3} a_z )
Answer» B. ( frac{1}{3} a_x + frac{1}{3} a_y + frac{1}{3} a_z )


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