If U Log X 2 Y 2 Z 2 Then X ∂ 2u∂y∂z Y ∂ 2u∂z∂x Z ∂ 2u∂x∂y

If U Log X 2 Y 2 Z 2 Then X ∂ 2u∂y∂z Y ∂ 2u∂z∂x Z ∂ 2u∂x∂y
If U Log X 2 Y 2 Z 2 Then X ∂ 2u∂y∂z Y ∂ 2u∂z∂x Z ∂ 2u∂x∂y
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