# Rules of Graphing We Do (or Don't) Have Exercises

### Example 1

Use a calculator to graph the polar function.

*r*= cos*θ*for 0 ≤ θ ≤ π

### Example 2

Use a calculator to graph the polar function.

*r*= cos(2*θ*) for 0 ≤*θ*≤ 2π

### Example 3

Use a calculator to graph the polar function.

- for 0 ≤
*θ*≤ 4π.

### Example 4

Without a calculator, graph the polar function
*r* = 1 + sin *θ*
for
0 ≤ *θ* ≤ 2π.