it seems first easy to me, but now i am tossing my head against wall not being able to solve the problem. i need to check for convergence of this sequence below. i dont know how to start although it seems to be very easy one
$\lim_{n \to \infty} i^{3n} = help = ?$
i need help here. do i have to work with $exp$ here? i seem to have enough material in my brain and cannot use them on time. tragedy!