设函数f(x)=cos(ωx+φ)(x∈R)(ω>0,-π<φ<0)的部分图象如图所示,如果

设函数f(x)=cos(ωx+φ)(x∈R)(ω>0,-π<φ<0)的部分图象如图所示,如果，x≠x,且f(x)=f(x),则f(x+x)=

A. B. C. D．

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