Cho $ \Delta ABC $, trong đó $AB = c, BC = a, CA = b.$
p = $ \frac{a + b + c}{2} $ ; $R$ là bán kính đường tròn ngoại tiếp ; $r$ là bán kính đường tròn nội tiếp.
1. Tính $ (\sin A + \sin B)(\sin B + \sin C)(\sin C + \sin A) $ theo $p, R, r.$
2. T = $ (\sin B + \sin C - \sin A)(\sin A + \sin C - \sin B)(\sin A + \sin B - \sin C) $ theo $ p, r, R.$

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