在三角形ABC中,已知AC=2,AB=1,且角A、B、C满足cos2A+2sin^2(B+C/2)=1.急在三角形ABC中,已知AC=2,AB=1,且角A、B、C满足cos2A+2sin^2(B+C/2)=1,(I)求角A大小和BC边长(II)若点P是线段AC上的动点,设点P到边AB、BC的距离
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![在三角形ABC中,已知AC=2,AB=1,且角A、B、C满足cos2A+2sin^2(B+C/2)=1.急在三角形ABC中,已知AC=2,AB=1,且角A、B、C满足cos2A+2sin^2(B+C/2)=1,(I)求角A大小和BC边长(II)若点P是线段AC上的动点,设点P到边AB、BC的距离](/uploads/image/z/6898501-37-1.jpg?t=%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E5%B7%B2%E7%9F%A5AC%3D2%2CAB%3D1%2C%E4%B8%94%E8%A7%92A%E3%80%81B%E3%80%81C%E6%BB%A1%E8%B6%B3cos2A%2B2sin%5E2%28B%2BC%2F2%29%3D1.%E6%80%A5%E5%9C%A8%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2C%E5%B7%B2%E7%9F%A5AC%3D2%2CAB%3D1%2C%E4%B8%94%E8%A7%92A%E3%80%81B%E3%80%81C%E6%BB%A1%E8%B6%B3cos2A%2B2sin%5E2%28B%2BC%2F2%29%3D1%2C%28I%29%E6%B1%82%E8%A7%92A%E5%A4%A7%E5%B0%8F%E5%92%8CBC%E8%BE%B9%E9%95%BF%28II%29%E8%8B%A5%E7%82%B9P%E6%98%AF%E7%BA%BF%E6%AE%B5AC%E4%B8%8A%E7%9A%84%E5%8A%A8%E7%82%B9%2C%E8%AE%BE%E7%82%B9P%E5%88%B0%E8%BE%B9AB%E3%80%81BC%E7%9A%84%E8%B7%9D%E7%A6%BB)
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