If a, ß and y are the zeroes of the cubic polynomial ax3 + bx2 + cx + d, then
1\αβ +1\βγ +1\γα
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b/d .. 1.) make the denominator (alpha beta gamma) i. e. LCM or product of roots (-d/a) 2.) after taking LCM numerator will become sum of roots (-b/a)
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