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With usual notations, if in a triangle ...

With usual notations, if in a triangle ABC `(b+c)/(11) = (c+a)/(12) = (a+b)/(13)`, then cos A : cos B : cos C is :

A

`7:19:25`

B

`19:7:25`

C

`12:14:20`

D

`19:25:20`

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The correct Answer is:
A
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