函数y=12(ex+e−x)的导数是( ) A.12(ex−e−x) B.12(ex+e−x) C.ex-e-x D.ex+e-x
问题描述:
函数y=
(ex+e−x)的导数是( )1 2
A.
(ex−e−x)1 2
B.
(ex+e−x)1 2
C. ex-e-x
D. ex+e-x
答
∵y=
(ex+e−x),1 2
∴y′=
(ex−1×e−x)=1 2
(ex−e−x).1 2
故选A.