It's impossible to give exact answer as you've not attached the image. But I think I can help you by giving some rulles about rotation. 180° rotation is (x;y) change to (-x;-y); 90° counterclockwise (x,y) change to (-y, x); then clockwise <span>90° (x,y), cange to (y, -x). Hope it will help.
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Answer:
The period is smaller than π/2 so the only possible answer would be 2π/5
Frequency is the amount of cycles it completes in 2π, so it's 5
