Roots

If m is positive, n Rac m returns n-th root from m.

 Example 1 :  root( 2, 9 )     -> 3

 Example 2 :  root( 2, 4 )     -> 2

 Example 3 :  root( 3, 27 )    -> 3

 Example 4 :  root( 3.5, 6.2 ) -> 1.6842153669

 Syntax : rac( n, x ) | root( n, x )