There seems to be quite a lot of questions that demand for textbook answers. These are technically not homework questions - i.e., they are not asking for solutions to problems - but grounded in not having read the relevant chapter of a textbook. They are not necessarily trivial either - i.e., they may concern some advanced but still textbook topics, and often it is the material that the OP might have not studied yet.
My approach is to indicate in the comments where it can be looked up, and to propose closure of the question as a homework level. However, I would appreciate the opinions of the community on this subject (probably this has already been discussed).
Update Let me propose a definition of a textbook question: it is a one that can be answered by reproducing verbatim a sentence/paragraph/chapter from a textbook. (Assuming that it is a frequently used textbook or that there are many textbooks on the subject.)
Let me also note that many of us here have spent years studying, reading textbooks, thinking them over, doing homeworks, carrying out research and so on. While not everyone has equal ability, we do expect that people asking questions are making effort to learn things, rather than looking for a speedier way of obtaining knowledge: e.g., by typing a question on the phone instead of paging through a textbook or going to a library.