You are correct. It’s brilliant.org, although I seem to have found it somehow using “.com” as well.
Regardless, I’m copying a message to which I responded to either another member of the Brave community, or perhaps, I’m just not being clear in my description of the problem.
As I point out below, this is not a problem will all math type-set viewed on Brave. It appears very specific, perhaps ASCII-specific.
The title of the course is “Complex Numbers.”
I’ve provided a comparative set of pdfs of one page, involving complex numbers.
In math typology, “Z” is a complex number and it’s conjugate is denoted with a bar above the Z. See Firefox version and compare to Brave version. Focus on the first sentence. In the Brave version the bar above the Z denoted the conjugate of Z is missing on Brave, but not on Firefox.
Here’s a link the that webpage: https://brilliant.org/practice/the-triangle-inequality-2/?p=8
Finally, as second example, more glaring, the Brave version fails to show the division or rational number symbol between the numerator and denominator at https://brilliant.org/practice/arithmetic-shortcuts/?p=6
See respective screen shots of that also attached.