n-th root : root

root takes two arguments : an integer n and a number a.
root returns the n-th root of a (i.e. a^1/n). If a < 0, the n-th root is a complex number of argument 2$\pi$/n.
Input :

root(3,2)

Output :

2^(1/3)

Input :

root(3,2.0)

Output :

1.259921049892

Input :

root(3,sqrt(2))

Output :

2^(1/6)