# 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.

• @Moo A book would be better because I was already reading that. – EnlightenedFunky Oct 26 '16 at 0:18
• @Moo Thanks :) 1+ – EnlightenedFunky Oct 26 '16 at 0:24
• $f(x)=\frac{1}{x^2+1}$ (the graph of a "witch of Agnesi") is a decreasing function on $\mathbb{R}^+$, while $\frac{\sin x}{x}$ is not, hence $f(x)=\frac{\sin x}{x}$ cannot be for sure a "witch of Agnesi". – Jack D'Aurizio Oct 26 '16 at 0:42