If symbols have their usual meaning then (1/r^2 ) + (1/r_1 ^2 ) + (1/r_2 ^2 ) + (1/r_3 ^2 ) = (1) ((a^2 + b^2 + c^2 )/s^2 ) (2) (Δ/(a^2 + b^2 + c^2 )) (3) ((a^2 + b^2 + c^2 )/Δ^2 ) (4) ((a + b + c)/Δ^2 )


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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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