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【简答题】
在锐角△ABC中，A，B，C所对的边分别为a，b，c．已知向量 m =（ 1 2 ，cosA）， n =（sinA，- 3 2 ），且 m ⊥ n （1）求角A的大小； （2）若a=7，b=8，求△ABC的面积．
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