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

Show that `(1)/(r^(2))+(1)/(r_(1)^(2))+(1)/(r_(2)^(2))+(1)/(r_(3)^(2))=(a^(2)+b^(2)+c^(2))/(Delta^(2))`

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