Question

(cos x + 0,5) (cos x + 1) = 0

Answer 1

(cos x + 0,5)(cos x + 1) = 0
cos x + 0,5 = 0 или cos x + 1 = 0
cos x = -0,5 или cos x = -1
x = (+/-) 2π/3 + 2πn, n є Z
x = π + 2πk, k є Z