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若函数f(x)的反函数f-1(x)=1+x2(x<0),则f(2)=( ) A....
若函数f(x)的反函数f-1(x)=1+x2(x<0),则f(2)=( )
A.1
B.-1
C.1和-1
D.5
考点分析:
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