= 0, wherer = (x + y2 + z2)1/2 ex. show that v2 1 v + oy x+y+z sol. 1 now ox (x+y +z2a 3x2 1 (x+y2+z2 5/2 (x+y+z )3/2 3y? similarly, (x+ y2+z2 sa (x+y+z2 1 2 3z

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