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If in DeltaABC, (b+c)/(11)=(c+a)/(12)=(a...

If in `DeltaABC`, `(b+c)/(11)=(c+a)/(12)=(a+b)/(13)`, then `cosA` equals :

A

`(1)/(5)`

B

`(5)/(9)`

C

`(17)/(35)`

D

None of these

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The correct Answer is:
A
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