I needed help on two question please, that are:
1] Find the three cube roots of 8(cos 264º + j sin 264º) and state which of them is the principal cube root. Show all three roots on an Argand diagram.
2] i) Expand sin 4θ in powers of sinθ and cosθ.
ii) Expand cos^4θ in terms of cosines of multiples of θ.