Hi guys, I have attached my derivation in the image below. Im not solving the ode, but I need a relationship in this equation. To solve that, I need to make the final part which is

to zero, is there anyway that I could make it zero, any theorem that could solve this, I need this very urgently, I am almost solving my own relationship in my system.Code:`[-B/1.101e-17+BN(t)-betaBN(t)]S(t)`

Please suggest what I can do. Thank you.