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26. 2[a.sin(C/2) + c.sin(A/2)] = c + k, then k = ? (1) a + b (2) a - b (3) b - a (4) s + a |
| Answer» 26. 2[a.sin(C/2) + c.sin(A/2)] = c + k, then k = ? (1) a + b (2) a - b (3) b - a (4) s + a | |