A.-1              B.-              C.-或-1              D.或-1

A.y′=                                   B.y′=

C.y′=                                   D.y′=

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.（）′=                                        B.()′=

C.()′=                                          D.()′=

(1)y=(n≠0);

(2)y=+.

(1)()′

=

=.

(2)()′

=

=.

(3)()′==.

(4)()′

=.

(5)()′

=

=.