You can also consult me, class tutors, other faculty, friends, and family. However, the homework you hand in should represent your own understanding. This means that if your friends get a homework problem and you don't understand how they did it, you shouldn't photocopy their solution and turn it in. Any cases of academic misconduct will result in a judicial hearing, as per pp. 14-15 of the COA handbook.
Possible consequences range from failure of the assignment to expulsion.
For more, see the statement on academic misconduct passed unanimously by the faculty last winter.