Turning Parabolas
Dan Anderson posted a sweet Daily Desmos challenge, which prompted Harry O'Malley to ask "I want to know which of these parabolas are functions. The original parabola is a function. And so is the one created by rotating the original 180 degrees and 360 degrees. But what about the others? More simply: Which rotational amounts produce functions?"
I wanted to make an interactive to poke around, so... here!
Original DD challenge
Harry's tweet, answer in thread
