Решить
а)cos4x=1
б)cos2x=-1
в)cos(x+П/3)=0

Решениеа) cos4x = 14x = 2πk, k∈Zx = πk/2, k∈zб) cos2x= -12x = π + 2πn, n∈zx = π/2 + πn, n∈Zв) cos(x +π/3)=0x + π/3 = π/2 + πm, m∈Zx = π/2 - π/3 + πm, m∈Zx = π/6 + πm, m∈Z