第2346题：验证解
验证以下哪些函数是方程 (2x−1)y′′− (2x-1)y''-(2x−1)y′′− (2x+1)y′+2y=0(2x+1)y'+2y=0 (2x+1)y′+2y=0 的解.
A. y=cosxy= \cos xy=cosx
B. y=exy=e^xy=ex
C. y=e−xy=e^{-x}y=e−x
D. y=lnxy= \ln xy=lnx
E. y=2x+1y=2x+1y=2x+1
