Answer
$$r = \frac{3}{{\cos \left( {\theta - \pi /4} \right)}}$$
Work Step by Step
$$\eqalign{
& r = \frac{3}{{\cos \left( {\theta - \pi /4} \right)}} \cr
& {\text{Using a graphing utility to graph the polar equation }}\left( {{\text{Geogebra}}} \right) \cr} $$
