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| 1. |
In `DeltaABC, (b+c)/(11) = (c+a)/(12)=(a+b)/(13)`, prove that: `cosA:cosB:cosC=?`A. `25:19:17`B. `9:7:25`C. `7:9:25`D. `7:19:25` |
| Answer» Correct Answer - D | |