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With usual notations, if in a triangle A...

With usual notations, if in a triangle ABC,
`(b+c)/11 = (c+a)/12 = (a+b)/13`, then cosA : cosB : cosC is equal to

A

`7 : 19: 25`

B

`19 : 7 : 25`

C

`12 : 14 : 20`

D

`19 : 25 : 20`

Text Solution

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The correct Answer is:
A
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