题目

Look at the picture. This is our school. There are five buildings in our school. There are thirty—two classrooms in the Teaching Building. Our gym is behind the Teaching Building. The teachers' offices are in the Office Building. Our Library Building is next to the Office Building. There are many books and magazines (杂志）in the library. Is the Library Building next to the Science Lab Building? No, it's in front of it. There are seven labs in it. Behind the Science Lab is the dining hall. In the dining hall there are many tables and chairs. We have meals there. Welcome to our school.【1已知tanα=2，则=    ．