问题
填空题
设y=
|
答案
∵α为第二象限角，∴0＜sinα＜1，-1＜cosα＜0．∴sin（cosα）＜0，且 cos（sinα）＞0，
∴y=
＜0，sin(cosα) cos(sinα)
故答案为：＜．
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设y=
|
∵α为第二象限角，∴0＜sinα＜1，-1＜cosα＜0．∴sin（cosα）＜0，且 cos（sinα）＞0，
∴y=
＜0，sin(cosα) cos(sinα)
故答案为：＜．
We feel 小题4:__ sorry for the loss of lives. There is小题5:__ we can do to bring the students back, but we can try to prevent (防止) such things from 小题6:__ again. You should do the following things to prevent a stampede (踩踏)。 After class or school, don’t rush out at the same time. Wait until there are小题7:__ people trying to leave.When you walk with a crowd of people, stay alert (警惕的) and 小题8:your steps. Don’t play around. Be familiar with your 小题9:_ and learn where the safety exits are. When there’s pushing and squeezing (挤)，don’t move and try to hold on to something. 小题10:___ stay in a corner until the crowd leaves. |