In `triangleABC`, If `(b+c)/(11)=(c+a)/(12)=(a+b)/(13)`, then `cosC=`A – InterviewSolution

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1.	In `triangleABC`, If `(b+c)/(11)=(c+a)/(12)=(a+b)/(13)`, then `cosC=`A. `(5)/(7)`B. `(7)/(5)`C. `(16)/(17)`D. `(17)/(16)`
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