I'm new here hopefully I'm asking everything ok!

I have a quiz tomorrow in trigonometry, and basically you have to fill out all the sin and cosine functions of the unit circle in 5 minutes...Are there any easy ways or tricks to memorize them fast?

The quiz we took (Every kid failed in the class so we get to retake it): http://i1165.photobucket.com/albums/q59 ... /quiz2.jpg

As you can see i figured out most of all the values but then i ran out of time...the one things that i can't figure out is if its negative or not (well i can figure it out, but it takes to long)...any trick to that? THANKS!