Funny graphs

First, put your calculator in polar mode: mode screen

Then go to the graph menu and enter a formula: graph screen

And this is what you will see:

n r = sin (θ*n) r = sin (θ/n) r = ±sin (5θ)
θStep = π/n
r = ±sin (7θ)
θStep = π/n
1
2
3
4
5
6
7
8
9
 
7/3
8/3
10/3
11/3
1.5
2.5
3.5
4.5
5.5