x ∈ R
(2 Sin x - √3) ( 2 Cos² x - 1) = 0
=> 2 Sin x - √3 = 0 ou 2 Cos² x = 1
=> Sin x = √3/2 ou Cos x = + 1/√2 ou -1/√2
x = π/3 ou 2π/3 ou x = π/4 ou 7π/4 ou 3π/4 ou 5π/4
Donc, x = 2 n π + π / 3, n ∈ N , l'ensemble des nombres entiers.
= 2 n π + 2π / 3
= 2 n π + π / 4
= 2 n π + 3 π / 4
= 2 n π + 5 π / 4
= 2 n π + 7 π /4
ou,
x = 2 n π + π / 3
= 2 n π + 2 π /3
= n π + π / 4
= n π + 3 π / 4