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已知圆\({C_1}:{\left( {x + 2} \right)^2} + {\left( {y - 1} \right)^2} = 1\)，圆\({C_2}\)与圆\({C_1}\)关于直线\(y = x + 1\)对称，则圆\({C_2}\)的标准方程是___
参考答案：\({x^2} + {\left( {y + 1} \right)^2} = 1\)
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