A.a₀n!                          B.a₀                                                        

C.a^n－1                         D.0

A.可导                         B.不可导                      C.不一定可导                     D.不能确定

A.sinα                          B.cosα                         C.sinα+cosα                 D.2sinα

①（2x³－cosx）'=6x²+sinx

②（2－）'=

③［（3+x²）（2－x³）］'=2x（2－x³）+3x²（3+x²）

④（）'=

⑤

⑥（tanx）'=

A.①②③⑤                                                     B.②④⑤⑥

C.①②⑤⑥                                                     D.①②③④⑤⑥

A.（x>0）                                                       B.（x>0）

C.（x>0）                                                     D.（x>0）

A.－5x^－6－3cosx                                                    B.x^－6+3cosx

C.－5x^－6+3cosx                                                      D.x^－6－3cosx'

A.－sec²                                             B.secx·tanx                  

C.                                            D.