value of the expression `(b-c)/(r_(1))+(c-a)/r_(2)+(a-b)/r_(3)` is equ – InterviewSolution

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1.	value of the expression `(b-c)/(r_(1))+(c-a)/r_(2)+(a-b)/r_(3)` is equal toA. 1B. 2C. 3D. 0
Answer» `((b-c))/(r_(1))+((c-a))/r_(2)+((a-b))/r_(3)` `rArr (b-c)((s-a)/(Delta))+(c-a)((s-b)/(Delta))+(a-b)((s-c)/(Delta))` `rArr ((s-a)(b-c)+(s-b)(c-a)+(s-c)(a-b)])/(Delta)=(0)/(Delta)=0` Thus , `(b-c)/r_(1)+(c-a)/r_(2)+(a-b)/r_(3)=0`

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