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d^2/dx^2 (x^2 +y^2+z^2)^(-1/2), d^2/dy^2( x^2 +y^2+z^2)^(-1/2), d^2/dz^2 (x^2 +y^2+z^2)^(-1/2)
d^2/dx^2 (x^2 +y^2+z^2)^(-1/2), d^2/dy^2( x^2 +y^2+z^2)^(-1/2), d^2/dz^2 (x^2 +y^2+z^2)^(-1/2)
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