i need to graph a sine function.

Hello all! I'm really confused at how to plot the points of this sine function... read on!

**THE QUESTION:**** Sketch the graph of the function by hand. use a graphing utility to verify your sketch (include two full periods).**

*I have to include the key points of the graph, the period and the amplitude*

**THE FUNCTION:** http://i54.tinypic.com/2vcapfk.jpg

i calculated the period and amplitude (although I'm not certain if they're correct)

period: 2pi

amplitude: (1/2)

Thank you so much! please include your work! I need to learn how to do this! :D any explanations will be greatly appreciated...