Question

Evaluate sin pie Please tell me how to do it as well. P
ossible answers: A. 0
B -1
C srqt 2 / 2
d None of these

Answer 1

There's a couple of ways to do this, I'd recommend using a unit circle though, its easiest, here's one.
http://withfriendship.com/images/b/8803/Unit-circle-picture.gif
For reading it, look around the circle to Pi, and then the co-ordinate on the outside reads (Cos x , Sin x)
From this you'll see that when x = Pi, Sin x = 0