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(一)设f(x)的定义域为R,仔细研究A、B、C之间的关系A:f(2+X)=f(2-X)B:y=f(X)为偶函数
(a) Let f(x) be defined as R, and carefully study the relationship between A, B, and C. A: f(2+X)=f(2-X)B:y=f(X) is even function