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Question Number 23721 by Tinkutara last updated on 06/Nov/17

If symbols have their usual meaning

then \frac{1}{r^{2}} + \frac{1}{r_{1}^{2}} + \frac{1}{r_{2}^{2}} + \frac{1}{r_{3}^{2}} =

(1) \frac{a^{2} + b^{2} + c^{2}}{s^{2}}

(2) \frac{Δ}{a^{2} + b^{2} + c^{2}}

(3) \frac{a^{2} + b^{2} + c^{2}}{Δ^{2}}

(4) \frac{a + b + c}{Δ^{2}}

Answered by Tinkutara last updated on 07/Nov/17

Commented by ajfour last updated on 07/Nov/17

t h a n k a l o t .

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