题目内容
求(cosx+ex)dx.
1-
(cosx+ex)dx=cosxdx+exdx
=sinx|+ex|=1-.
①(3x)′=3x·ln3
②(2+sinx+ex)′=cosx+ex
③(+cosx)′=+sinx
④()′=
A.1 B.2 C.3 D.4