题目

阅读短文, 判断正误。This is a picture of the twin sisters' room. It is a nice room. Lily's books are on the desk. Her backpack is on the floor. Liz's pencils are on the books. Her backpack is behind her chair. Their coats are behind the door. We can't see Lily and Liz in the picture. They're not at home. （1） This is a picture of Lily and Liz'sroom. （2） Lily's backpack is behind the chair. （3） Liz's and Lily's coats are on the chair. （4） Lily and Liz are not at home. （5） Their room is nice. 如图，在四边形ABCD中，E、F分别是AB、AD的中点，若EF＝6，BC＝13，CD＝5，则tanC等于________．