f2013的精选

问题详情：设函数f(x)＝，那么f(2013)＝()A．27                                               B．9C．3                                  ...

问题详情： 设f(n)=cos(+),则f(1)+f(2)+f(3)+…+f(2013)等于()(A)         (B)-          (C)0      (D)【回答】B解析:f(n)=cos(+)的周期T=4;且f(1)=cos(+)=cos=-, f(2)=cos(π+)=-,f(3)=c...

问题详情：已知函数f(x)＝asin(πx＋α)＋bcos(πx＋β)，且f(4)＝3，则f(2013)的值为()A．－1                                                   B．1C．3             ...