Respuesta :

Answer:

x = 90°

Step-by-step explanation:

Given

- 4 - 6cosx = - 4 - 4cosx ( add 4cosx to both sides )

- 4 - 2cosx = - 4 ( add 4 to both sides )

- 2cosx = 0, hence

cosx = 0

x = [tex]cos^{-1}[/tex](0) = 90° for 0 ≤ x ≤ 180