题目

 Mike ________ his car, for he came to work by bus this morningA. can have found                                B. could have found      C. can’t have found                             D. mustn’t have found       答案：C已知f1(x)＝Asin(ωx＋)(A＞0，ω＞0，||＜)的部分图象如下图所示： (1)求此函数的解析式f1(x)； (2)与f1(x)的图象关于x＝8对称的函数解析式f2(x)；求f1(x)＋f2(x)单增区间