Question

Решите уравнение плз (cosx)^2-6cosx=0

Answer 1

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