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(1)/(r^(2))+(1)/(r(1)^(2))+(1)/(r(2)^(2)...

`(1)/(r^(2))+(1)/(r_(1)^(2))+(1)/(r_(2)^(2))+(1)/(r_(3)^(2))` equals

A

`(a^(2)+b^(2)+c^(2))/(Delta)`

B

`(a^(2)+b^(2)+c^(2))/(Delta)^2`

C

`(Delta^(2))/(a^(2)+b^(2)+c^(2))`

D

`(Delta)/(a^(2)+b^(2)+c^(2))`

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