Question

Develop a formula Cosine (4 theta) as a fourth-degree polynomial in the variable equals what cosine (theta)?

Answer 1

have you learnt about \(e^i\theta=\cos(\theta)+i\sin(\theta)\)?

Answer 2

sorry that should be \(e^{i\theta}\)

Answer 3

I think he/she want taylor approximation

Answer 4

why do you say that?

Answer 5

something about fourth degree polynomial

Answer 6

well it will involve terms like \(\cos^4(\theta)\)

Answer 7

maybe @coolcat93 can confirm for us...