Moderator Note: this is a question from the Federal Mathematics Competition 2013.
So here's another quite complex problem: $P$ is a point in the interior of a square $ABCD$, such that $\angle DCP = \angle CAP = 25^\circ$. What is $\angle ***PBA***$?
Does anybody have any ideas on this problem? I tried to find as much angles as I could, but I just got stuck...
Hope for some good answers :)