(1) 略
(2) 1 + \(x^{2}\) + (\(\frac{3}{2}\))\(x^{4}\) + (\(\frac{5}{2}\))\(x^{6}\) + (\(\frac{35}{8}\))\(x^{8}\) + (\(\frac{63}{8}\))\(x^{10}\) + (\(\frac{231}{16}\))\(x^{12}\)
+ (\(\frac{429}{16}\))\(x^{14}\) + (\(\frac{6435}{128}\))\(x^{16}\) + (\(\frac{12155}{128}\))\(x^{18}\) + ...