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With usual notation,in Delta ABC (b+c)/(...

With usual notation,in `Delta ABC (b+c)/(11)=(c+a)/(12)=(a+b)/(13)` then `cos A:cos B:cosC`
1.`7:19:25`
2.`19:25:7,`
3`19:7:25`
4.`7:25:19`

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