在△ABC中,角A,B,C所对的边分别是a,b,c,若sin²B+sin²C=sin²A+sinBsinC,且向量AC乘向量AB求△ABC的面积向量AC乘向量AB等于4
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![在△ABC中,角A,B,C所对的边分别是a,b,c,若sin²B+sin²C=sin²A+sinBsinC,且向量AC乘向量AB求△ABC的面积向量AC乘向量AB等于4](/uploads/image/z/2501084-20-4.jpg?t=%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E8%A7%92A%2CB%2CC%E6%89%80%E5%AF%B9%E7%9A%84%E8%BE%B9%E5%88%86%E5%88%AB%E6%98%AFa%2Cb%2Cc%2C%E8%8B%A5sin%26%23178%3BB%2Bsin%26%23178%3BC%3Dsin%26%23178%3BA%2BsinBsinC%2C%E4%B8%94%E5%90%91%E9%87%8FAC%E4%B9%98%E5%90%91%E9%87%8FAB%E6%B1%82%E2%96%B3ABC%E7%9A%84%E9%9D%A2%E7%A7%AF%E5%90%91%E9%87%8FAC%E4%B9%98%E5%90%91%E9%87%8FAB%E7%AD%89%E4%BA%8E4)
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