Shortcut for Element not working inside Integral
Using l:=Solutions(...) is a handy way to get a list of values of interest.
I like to use these values subsequently using shortcut l(1), l(2),....
This is working most of the times, but not in this example where these values are parameters to Integral (see attached example).
So x_1:=l(1) and subsequently Integral(..,x_1,...) is working, while Integral(...,l(1),...) crashes immediately.