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With usual notation , if in triangle ABC...

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

A

`7 : 19 : 25`

B

`19 : 25 : 7`

C

`19 : 7 : 25`

D

`7 : 25 : 19`

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A
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