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4.【答案】C【解折】令两数m倒)=fra)-方m()=方+om,.m(x)=m(-x),∴.函数m(x)为偶函数，又m(0)=1,且m'(x)=x-sinx,当x>0时，m'(x)>0,∴.函数m(x)在(0，+∞)单调递增，故选C.

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