已知O是三角形ABC外接圆的圆心,A,B,C为三角形ABC的内角,若(cosB/sinC)向量AB+(cosC/sinB)向量AC=2m向量AO则m的值为:A.1 ,B.sinA .C.cosA D,tanA
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![已知O是三角形ABC外接圆的圆心,A,B,C为三角形ABC的内角,若(cosB/sinC)向量AB+(cosC/sinB)向量AC=2m向量AO则m的值为:A.1 ,B.sinA .C.cosA D,tanA](/uploads/image/z/987323-59-3.jpg?t=%E5%B7%B2%E7%9F%A5O%E6%98%AF%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E5%A4%96%E6%8E%A5%E5%9C%86%E7%9A%84%E5%9C%86%E5%BF%83%2CA%2CB%2CC%E4%B8%BA%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E7%9A%84%E5%86%85%E8%A7%92%2C%E8%8B%A5%28cosB%2FsinC%29%E5%90%91%E9%87%8FAB%2B%28cosC%2FsinB%29%E5%90%91%E9%87%8FAC%3D2m%E5%90%91%E9%87%8FAO%E5%88%99m%E7%9A%84%E5%80%BC%E4%B8%BA%EF%BC%9AA.1+%2CB.sinA+.C.cosA+D%2CtanA)
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