A:asked
B:arranged
C:sent
D:called
(1) ( cosxx )′= −sinxx2
(2) (x2+x+1)ex′=(2x+1)ex
(3) ( 2xx2+1 )′= 2−2x2(x2+1)2
(4) (e3x+1)′=3e3x+1.
如图是动物细胞和植物细胞的结构模式图,请据图回答以下问题: