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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 ^(2))`

B

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

C

`(S^(2))/(Delta ^(2))`

D

`(4s^(2))/( Delta ^(2))`

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The correct Answer is:
A
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