Can't read your code. This how it shows up on my screen (firefox)
![](/c/portal/getImageAttachment?filename=2205Untitled.png&userId=89105)
But you can always add lines using Epilog, or combine plots using Show and many other ways. Assuming your "\" is say "x",
you can do
z = 45 Degree;
PolarPlot[{0, 1, Sin[3 x]}, {x, 0, 2 \[Pi]},Epilog -> {Arrow[{{0, 0}, {Cos[z], Sin[z]}}], Arrow[{{0, 0}, {-Cos[z], Sin[z]}}]}]