i have an assignment question hopefully someone can help me with or point me in the right direction....
the question comes in 3 parts.i have done parts (i),(ii) i need to work out the 3rd part(iii).
(ii) if the roots of a cubic equation are x= -5/2 , x= 1/4, x= 3
determine the cubic expression by expansion, with these roots.
(iii) if x = Cos(2ω) in part (ii) of this question where ω is measured in radians. determine the values of ω, that satisfy the roots given that
0 ≤ ω ≥ 2(pi)
any help much appreciated