已知a、b、c分别为△ABC的三个内角A、B、C的对边,且△ABC的面积S,(1)当2cosA/2+cos(B+C)取得最大值时,求A已知a、b、c分别为△ABC的三个内角A、B、C的对边,且△ABC的面积S,(1)当2cosA/2+cos(B+C)取得最大值
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![已知a、b、c分别为△ABC的三个内角A、B、C的对边,且△ABC的面积S,(1)当2cosA/2+cos(B+C)取得最大值时,求A已知a、b、c分别为△ABC的三个内角A、B、C的对边,且△ABC的面积S,(1)当2cosA/2+cos(B+C)取得最大值](/uploads/image/z/7799683-67-3.jpg?t=%E5%B7%B2%E7%9F%A5a%E3%80%81b%E3%80%81c%E5%88%86%E5%88%AB%E4%B8%BA%E2%96%B3ABC%E7%9A%84%E4%B8%89%E4%B8%AA%E5%86%85%E8%A7%92A%E3%80%81B%E3%80%81C%E7%9A%84%E5%AF%B9%E8%BE%B9%2C%E4%B8%94%E2%96%B3ABC%E7%9A%84%E9%9D%A2%E7%A7%AFS%2C%281%29%E5%BD%932cosA%2F2%2Bcos%28B%2BC%29%E5%8F%96%E5%BE%97%E6%9C%80%E5%A4%A7%E5%80%BC%E6%97%B6%2C%E6%B1%82A%E5%B7%B2%E7%9F%A5a%E3%80%81b%E3%80%81c%E5%88%86%E5%88%AB%E4%B8%BA%E2%96%B3ABC%E7%9A%84%E4%B8%89%E4%B8%AA%E5%86%85%E8%A7%92A%E3%80%81B%E3%80%81C%E7%9A%84%E5%AF%B9%E8%BE%B9%2C%E4%B8%94%E2%96%B3ABC%E7%9A%84%E9%9D%A2%E7%A7%AFS%2C%281%29%E5%BD%932cosA%2F2%2Bcos%28B%2BC%29%E5%8F%96%E5%BE%97%E6%9C%80%E5%A4%A7%E5%80%BC)
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