1.

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

Answer»

`7 : 19 : 25`
`19 : 25 : 7`
`19 : 7 : 25`
`7 : 25 : 19`

ANSWER :A


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