Amplitude, Period, and Displacement?

Hi all...after finishing my homework tonight I decided to keep going in the chapter to get ahead. Yeah, I was also enjoying myself too!

The next part of the chapter deals with Amplitude, Period, and Displacement.

Here is a sample question from the book.

Determine the amplitude, period, and displacement of the given function. Then sketch the graph of the function.

$\displaystyle \displaystyle y = 2\ cos \displaystyle \left(x\, + \frac{\pi}{12}\right)$

Could someone break this type of problem down to it's parts so I can work my way through this section of the chapter?

Once again, I'm taking my math online which means I've basicly become my own teacher.