Simplify the followings:
 
(i) \(3^{\frac{2}{9}} \times 3^{\frac{1}{8}}\) \(=\) iii
 
(ii) \((\frac{1}{9}^5)^6\) \(=\) iii
 
(iii) \(\frac{13^{\frac{1}{5}}}{13^{\frac{1}{7}}}\) \(=\) iii
 
(iv) \(3^{\frac{1}{6}} \times 9^{\frac{1}{6}}\) \(=\) iii