【正确答案】y'=2e^2xsin(2x+1)+2e^2xcos(2x+1)
   =2e^2x[sin(2x+1)+cos(2x+1)]，
   y"=4e^2x[sin(2x+1)+cos(2x+1)]+4e^2x[cos(2x+1)-sin(2x+1)]
   =8e^2xcos(2x+1)．