.
W0 = 2*(cos(30) + i*sin(30)).
W1 = 2*(cos(150) + i*sin(150)). Notice that 150 = 30 + 120 = 30 + .
W1 = 2*(cos(270) + i*sin(270)). Notice that 270 = 30 + 2*120 = 30 + .
There is a bunch of lessons on complex numbers
- Complex numbers and arithmetical operations on them
- Complex plane
- Addition and subtraction of complex numbers in complex plane
- Multiplication and division of complex numbers in complex plane
- Raising a complex number to an integer power
- How to take a root of a complex number (*)
- Solution of the quadratic equation with real coefficients on complex domain
- How to take a square root of a complex number
- Solution of the quadratic equation with complex coefficients on complex domain
- Solved problems on taking roots of complex numbers (*)
- Solved problems on arithmetic operations on complex numbers
- Solved problem on taking square root of complex number
in this site.
In this list, the lessons marked by (*) specially relate to taking roots of high degree of complex numbers.
So, these lessons specially relate to your problem.
Also, you have this free of charge online textbook in ALGEBRA-II in this site
- ALGEBRA-II - YOUR ONLINE TEXTBOOK.
The referred lessons are the part of this online textbook under the topic "Complex numbers".