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In a DeltaABCV if (b+c)/(11)=(c+a)/(12)=...

In a `DeltaABCV` if `(b+c)/(11)=(c+a)/(12)=(a+b)/(13)` then cos C=

A

`5/7`

B

`7/5`

C

`(16)/(17)`

D

`(17)/(36)`

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A
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