Find all solutions to 2cos^2(x) - 7cos(x) +3 =0

Answer 1

2cos²x - 7cosx + 3 = 0; (2cosx ;- 1)(cosx - 3) = 0; 2cosx - 1 = 0 or cos - 3 = 0'

cosx = 1/2; x = π/3 + 2πn, x = 5π/3 + 2πn, n∈Z

cosx - 3 = 0; cosx = 3, no solutions