在三角形ABC中 a b c分别为角A B C的对边 且满足4cos2A/2-cos2(B+C)=7/2 1 求角A的大小
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![在三角形ABC中 a b c分别为角A B C的对边 且满足4cos2A/2-cos2(B+C)=7/2 1 求角A的大小](/uploads/image/z/14892635-11-5.jpg?t=%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD+a+b+c%E5%88%86%E5%88%AB%E4%B8%BA%E8%A7%92A+B+C%E7%9A%84%E5%AF%B9%E8%BE%B9+%E4%B8%94%E6%BB%A1%E8%B6%B34cos2A%2F2-cos2%28B%2BC%29%3D7%2F2+1+%E6%B1%82%E8%A7%92A%E7%9A%84%E5%A4%A7%E5%B0%8F)
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