I need major help graphing this!

[taetiseo]

y=0.5cos (2/3(x+pi))-2

Can someone please help me graph this?
I know how to graph y=cos(x), but i don't know how to find
the points for this, and what units should i use for the x-axis.
can someone please help?

thanks

 

[tkhunny]

Draw your y = cos(x) first.

Draw your y = 0.5*cos(x) second. It should look exactly like the first one, only the Range is now [-1/2,1/2] instead of [-1,1]

Draw your y = 0.5*cos(x) - 2 third. It should look exactly like the previus one, only the Range is now [-5/2,-3/2] instead of [-1/2,1/2]

Now what?