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Prove that ((1)/(r)-(1)/(r(1)))((1)/(r)-...

Prove that `((1)/(r)-(1)/(r_(1)))((1)/(r)-(1)/(r_(2)))((1)/(r)-(1)/(r_(3)))=(abc)/(Delta^(3))=(4R)/(r^(2)s^(2))`

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