Simple graphing problem giving me trouble

Hi all. Simple problem here, but I'm having a hard time for some reason. It's a graphing problem. The equation is y = sqrt(3) - 2 sin(x). The graph is drawn but different points along the graph need to be named. There are 6 different points needed. They are (0,A) (B,0) (Pi/2,C) (D,0) (4Pi/3,E) and (3Pi/2,F)

Let me know if I need to explain better. A is obviously sqrt(3) right? I'm having trouble with the rest of the answers. I would like to know why the answers are what they are, and not just the answers. Thanks for your time.