y=4cos2θ+1 how do you graph this? It's a sine wave.

You should know what y=cosx looks like

That is your starting point

$$y=4cos(n\theta)+1 the amplitude is 4 The period is 2\pi/n \mbox{ The 1 on the end mean that the whole graph is raised 1 unit } \mbox{ so instead of it being centred on the x axis (y=0) it is centred on y=1}$$

Chris, how are you entering attachments - are they straight off the net?