In the triangle ABC, the opposite sides of a, B and C are respectively a, B and C. The vector M = (COSA, 1) the vector n = (1,1-radical 3sina), and the vector m ⊥ n (1) finds the size of angle a (2) if B + C = radical 3A, finds the size of B and C

(1)A=60°
(2) 30 degree, 90 degree or 90 degree, 30 degree

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