Past exam of the mathematics course of the year 1 of the natural sciences course of the University of Cambridge / 2013 / Paper 1 / 12 / a / Solution

The original PDF asks for cube roots of $8$. Their complex modulus is $2$, and their arguments are $2k\pi /3$, $k=0,1,2$. Converting to Cartesian form givesCubing any one gives the positive real number $8$.