This made me curious so I looked a bit into it. Seems that milquetoast as an insult originates from an old comic character of the same name, and it’s at least feasible (and perhaps likely) that said character was named after milk toast.
It’s a 14 book series. It’s generally acclaimed for its world building and depth, but understood to be a bit of a slog in the middle. The original author, Robert Jordan, died while writing the 12th book, and Brandon Sanderson was chosen by Jordan’s widow to finish the story using notes left by Jordan for his successor. I never finished it myself but I understand these final works were very well received, and Sanderson is a great author himself.
I tried punching in 243 and it gave me an equation that resolves to 235.
https://www.wolframalpha.com/input?i=(lim+((x^2-100)%2F(x%2B10))%2C+x->13)^5+-+([lim((e^(8x)-1)%2Fx)%2C+x->0]+-+[[lim+((x^2-36)%2F(x-6))%2Cx->-5]+-+lim(cos^2+x+%2B+sin^2+x)%2C+x->36])
Tried it a few other times and it seems to sometimes like giving something that results in 3^5 (which would be 243 on its own) followed by subtracting a bit from it, which ends up making it the wrong answer. In the link above, it basically goes (3^5) - (8 - (1 - 1)), so if you only keep the first brackets it would be correct.