Calculus Reference Request Currently while doing homework I encountered the Witches of Agnesi. I have done a tiny bit of research. I was wondering if $y=\frac{\sin(x)}{x}$ would be one of these witches. What type of math domain does the study of Witch of Agnesi pertain to? I am completely oblivious to math history a good book/online resource would be nice. I am in AP Calculus AB in high school if that needed in my question.

This is a fragment of an answer:

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Notice the several moving dotted lines in this video. A bunch of propositions in algebra and geometry are lurking in them.