Решите уравнение плз (cosx)^2-6cosx=0
Cos²x - 6·cos x = 0 cos x·(cos x - 6) = 0 cos x = 0 cos x = 6 x = π/2 + πn, n ∈ Z x ∈ ∅ x = π/2 + πn, n ∈ Z