2.在正方体ABCD−A1B1C1D1ABCD-A_{1}B_{1}C_{1}D_{1}ABCD−A1B1C1D1中,点MMM为棱ABABAB上的动点,则A1MA_{1}MA1M与平面ABC1D1ABC_{1}D_{1}ABC1D1所成角的取值范围为((( )))