(Ⅰ)当圆心O移动的距离为1cm时,则⊙O与直线PA的位置关系是____.
(Ⅱ)若圆心O的移动距离是d,当⊙O与直线PA相交时,则d的取值范围是____.
Today, WeChat(微信)becomes very popular, and more and more people like to use it to each other.
直线xsinα+y+2=0的倾斜角的取值范围是( ).
34+28=____
74-36=____