高一数学啦 ..明天要交..在△ABC中,a,b,c分别为角A,B,C的对边,且4sin^2(B+C)/2-cos2A=7/2求角A的度数若a=√3,b+c=3,求b和c的值麻烦写下过程呐..谢谢啦
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![高一数学啦 ..明天要交..在△ABC中,a,b,c分别为角A,B,C的对边,且4sin^2(B+C)/2-cos2A=7/2求角A的度数若a=√3,b+c=3,求b和c的值麻烦写下过程呐..谢谢啦](/uploads/image/z/5633445-21-5.jpg?t=%E9%AB%98%E4%B8%80%E6%95%B0%E5%AD%A6%E5%95%A6+..%E6%98%8E%E5%A4%A9%E8%A6%81%E4%BA%A4..%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2Ca%2Cb%2Cc%E5%88%86%E5%88%AB%E4%B8%BA%E8%A7%92A%2CB%2CC%E7%9A%84%E5%AF%B9%E8%BE%B9%2C%E4%B8%944sin%5E2%28B%2BC%29%2F2-cos2A%3D7%2F2%E6%B1%82%E8%A7%92A%E7%9A%84%E5%BA%A6%E6%95%B0%E8%8B%A5a%3D%E2%88%9A3%2Cb%2Bc%3D3%2C%E6%B1%82b%E5%92%8Cc%E7%9A%84%E5%80%BC%E9%BA%BB%E7%83%A6%E5%86%99%E4%B8%8B%E8%BF%87%E7%A8%8B%E5%91%90..%E8%B0%A2%E8%B0%A2%E5%95%A6)
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