在三角形ABC中,已知AB=2,AC=1,且cos2A+2sin^2(B+C)/2=1求详细解答急(1)求角A的大小和BC边的长(2)若点P在三角形ABC内运动(含边界),且点P到三边距离之和为d,设点P到边BC、CA的距离分别为x,y,试用d表示,
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![在三角形ABC中,已知AB=2,AC=1,且cos2A+2sin^2(B+C)/2=1求详细解答急(1)求角A的大小和BC边的长(2)若点P在三角形ABC内运动(含边界),且点P到三边距离之和为d,设点P到边BC、CA的距离分别为x,y,试用d表示,](/uploads/image/z/6898504-40-4.jpg?t=%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E5%B7%B2%E7%9F%A5AB%3D2%2CAC%3D1%2C%E4%B8%94cos2A%2B2sin%5E2%28B%2BC%29%2F2%3D1%E6%B1%82%E8%AF%A6%E7%BB%86%E8%A7%A3%E7%AD%94%E6%80%A5%281%29%E6%B1%82%E8%A7%92A%E7%9A%84%E5%A4%A7%E5%B0%8F%E5%92%8CBC%E8%BE%B9%E7%9A%84%E9%95%BF%282%29%E8%8B%A5%E7%82%B9P%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E5%86%85%E8%BF%90%E5%8A%A8%EF%BC%88%E5%90%AB%E8%BE%B9%E7%95%8C%EF%BC%89%2C%E4%B8%94%E7%82%B9P%E5%88%B0%E4%B8%89%E8%BE%B9%E8%B7%9D%E7%A6%BB%E4%B9%8B%E5%92%8C%E4%B8%BAd%2C%E8%AE%BE%E7%82%B9P%E5%88%B0%E8%BE%B9BC%E3%80%81CA%E7%9A%84%E8%B7%9D%E7%A6%BB%E5%88%86%E5%88%AB%E4%B8%BAx%2Cy%2C%E8%AF%95%E7%94%A8d%E8%A1%A8%E7%A4%BA%2C)
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