Which of the following sequences ana_nan is NOT convergent?
an=(1+1n2)na_n = (1 + \frac{1}{n^2})^nan=(1+n21)n
an=sin(nπ+1n)a_n = \sin(n\pi + \frac{1}{n})an=sin(nπ+n1)
an=nln(1+1n2)a_n = n \ln(1 + \frac{1}{n^2})an=nln(1+n21)
an=cos(n)na_n = \frac{\cos(n)}{n}an=ncos(n)