1.在ΔABC中,BC=5,AC=3,SINC=2SINA(1)求AB的值(2)求SIN(2A-π/4)的值2.在ΔABC中,角A,B,C对应的边分别为a,b,c且COSA=1/3(1)求sin[(B+C)/2]+COS2A的值(2)若a=根号3,求BC,最大值第一题:BC=根号5打错了不好意思
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![1.在ΔABC中,BC=5,AC=3,SINC=2SINA(1)求AB的值(2)求SIN(2A-π/4)的值2.在ΔABC中,角A,B,C对应的边分别为a,b,c且COSA=1/3(1)求sin[(B+C)/2]+COS2A的值(2)若a=根号3,求BC,最大值第一题:BC=根号5打错了不好意思](/uploads/image/z/1170742-22-2.jpg?t=1.%E5%9C%A8%CE%94ABC%E4%B8%AD%2CBC%3D5%2CAC%3D3%2CSINC%3D2SINA%281%29%E6%B1%82AB%E7%9A%84%E5%80%BC%EF%BC%882%EF%BC%89%E6%B1%82SIN%282A-%CF%80%2F4%29%E7%9A%84%E5%80%BC2.%E5%9C%A8%CE%94ABC%E4%B8%AD%2C%E8%A7%92A%2CB%2CC%E5%AF%B9%E5%BA%94%E7%9A%84%E8%BE%B9%E5%88%86%E5%88%AB%E4%B8%BAa%2Cb%2Cc%E4%B8%94COSA%3D1%2F3%281%29%E6%B1%82sin%5B%28B%2BC%29%2F2%5D%2BCOS2A%E7%9A%84%E5%80%BC%EF%BC%882%EF%BC%89%E8%8B%A5a%3D%E6%A0%B9%E5%8F%B73%2C%E6%B1%82BC%2C%E6%9C%80%E5%A4%A7%E5%80%BC%E7%AC%AC%E4%B8%80%E9%A2%98%EF%BC%9ABC%3D%E6%A0%B9%E5%8F%B75%E6%89%93%E9%94%99%E4%BA%86%E4%B8%8D%E5%A5%BD%E6%84%8F%E6%80%9D)
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