Reading this might help: Complex numbers : De Moivre's theorem : De Moivre's theorem and nth roots
You might also find this helpful: http://shawtlr.net/trig/trig_m11_slides.pdf
Reading this might help: Complex numbers : De Moivre's theorem : De Moivre's theorem and nth roots
You might also find this helpful: http://shawtlr.net/trig/trig_m11_slides.pdf