So I did two things to get this to plot. This still doesn't match the image at the top, but at least you don't have error messages anymore, so it's back to you and your domain knowledge.
One, when you make A a function A(b', t), you need to use that full function definition every time. In your plots and in Crip(E,b',t)'s definition, you just called it "A" instead of A(b', t).
Two, I got rid of the square brackets around Crip(E,b',t)'s definition. Square brackets aren't used for parenthesis in Mathcad but will turn things into matrices (or in this case, nested matrices, which the plot doesn't like). Instead in Mathcad, just keep using even more parenthesis.
I manage the Creo and PTC Mathcad YouTube channels for PTC, as well as all PTC Mathcad marketing in general.
