Method 2. Since cosine has period 27, we may add -2πn to the argument of the cosine without changing its value; therefore, lim cos (27n²2 + 3n V 818 A =lim cos (27n² + 3n – 2πη = lim_cos (2π (√n² + 3n − n)) - 84x nx = lim cos (27 (√n²+3n-n)) = lim cos 818 n→∞ = cos 3π = -1. 3 (2= 2 + 0(1))

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