CPM Homework Help : PC Problem 11-43

Suppose you are given a graph of r = f (θ) where f is some function. Homework Help ✎
1. What equation would rotate the graph 90°counter-clockwise?
2. What equation would rotate the graph 90°clockwise?

Answer (a):

$\textit{r}=\textit{f}(\theta-90\degree)=\textit{f}(\theta-\frac{\pi}{2})$

Hint (b):

How is this answer going to be the same as and/or different from the answer to part (a)?