1. The problem statement, all variables and given/known data the sequence is an = (cos(n))^2 / 2^n 2. Relevant equations none really 3. The attempt at a solution like i mentioned in my last post, i usually use l'hopitals or dividing by the largest exponent from the denominator. here, i dont see why i would want to use l'hopitals, so thats out of the question. i cant really divide by the largest exponent. is there a way i could break this down or something?