If A(x)=2x1−x2A(x) = \frac{2x}{1-x^2}A(x)=1−x22x, what is the sequence ana_nan?
an=1a_n = 1an=1 if nnn is odd, 000 if nnn is even
an=2a_n = 2an=2 if nnn is odd, 000 if nnn is even
an=2na_n = 2^nan=2n
an=na_n = nan=n