Something’s not working the way it seems like it should.

When I … was using desmos for my own math stuff, I defined the following functions in the order you see them from top to bottom

(Functions copy pasted below to help you replicate the bug)

f\left(x\right)=2-\sqrt{\left(\cos\left(u\right)\sqrt{1-x^{2}}\right)^{2}+\left(\sin\left(u\right)\sqrt{1-x^{2}}\right)^{2}+\left(x-1\right)^{2}}

u=0

g\left(x\right)=\frac{6}{4}\int_{-1}^{x}f\left(t\right)dt

y=\frac{f\left(x\right)}{g\left(x\right)}

I saw … everything stopped working, and an error appeared in the developer console of my browser. which read “ReferenceError: assignment to undeclared variable _XX” where XX is a number. Additional errors appeared that seemed like they were failing to connect to a bug reporting service called bugsnag, so I decided to make an account and manually report this.

But I expected … to see the function f(x)/g(x) be drawn. I was able to replicate this bug consistently by creating new tabs and trying this many times.

Here’s the link to the page, dashboard, or activity: This graph crashes desmos

And here are some screenshots or a video: