Issue with CAS solver function involving passing strings to the variable position.

[Gene222]

I'm just a novice, but it looks like you mixing text and variables in the string expression. Try something like:
Answer:=CAS("SOLVE(Â=K*A/(sqrt((1-(τ*ω)^2)^2+(2*τ*ω*E)^2))," + Find + ",1)");