设△ABC为锐角三角形,a,b,c,分别为内角A,B,C,的对边,而且sin²A=sin(π/3+B)sin(π/3-B)+sin²B若向量AB*向量AC=12 ,a=2根号7,求b,c.其中(b
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![设△ABC为锐角三角形,a,b,c,分别为内角A,B,C,的对边,而且sin²A=sin(π/3+B)sin(π/3-B)+sin²B若向量AB*向量AC=12 ,a=2根号7,求b,c.其中(b](/uploads/image/z/2806190-62-0.jpg?t=%E8%AE%BE%E2%96%B3ABC%E4%B8%BA%E9%94%90%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2%2Ca%2Cb%2Cc%2C%E5%88%86%E5%88%AB%E4%B8%BA%E5%86%85%E8%A7%92A%2CB%2CC%2C%E7%9A%84%E5%AF%B9%E8%BE%B9%2C%E8%80%8C%E4%B8%94sin%26%23178%3BA%3Dsin%28%CF%80%2F3%2BB%29sin%28%CF%80%2F3-B%29%2Bsin%26%23178%3BB%E8%8B%A5%E5%90%91%E9%87%8FAB%2A%E5%90%91%E9%87%8FAC%3D12+%2Ca%3D2%E6%A0%B9%E5%8F%B77%2C%E6%B1%82b%2Cc.%E5%85%B6%E4%B8%AD%EF%BC%88b)
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