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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