text: where the absolute value of the trigonometric factor is one. This results from
  Non-integer powers of complex numbers
  In the preceding sections, exponentiation with non-integer exponents has been defined for positive real bases only. For other bases, difficulties appear already with the apparently simple case of th roots, that is, of exponents  where  is a positive integer. Although the general theory of exponentiation with non-integer exponents applies to th roots, this case deserves to be considered first, since it does not need to use complex logarithms, and is therefore easier to understand.
  th roots of a complex number
  Every nonzero complex number  may be written in polar form as
  where  is the absolute value of , and  is its argument. The argument is defined up to an integer multiple of ; this means that, if  is the argument of a complex number, then  is also an argument of the same complex number for every integer .
  The polar form of the product of two complex numbers is obtained by multiplying the absolute values and adding the arguments. It follows that the polar form of an th root of a complex number can be obtained by taking the th root of the absolute value and dividing its argument by :