tiggerfamilytre
hammer of the underworld
- Joined
- Oct 8, 2004
- Messages
- 18
- Gender
- Male
- HSC
- 2005
please help me:
"find the roots of z^6 + 1 = 0 and hence resolve z^6 + 1 into real quadratic factors; deduce that cos3x = 4(cosx - cos[pi/4])(cosx - cos[pi/2])(cosx - cos[{5pi}/6])
"find the roots of z^6 + 1 = 0 and hence resolve z^6 + 1 into real quadratic factors; deduce that cos3x = 4(cosx - cos[pi/4])(cosx - cos[pi/2])(cosx - cos[{5pi}/6])
