Sin7x=sinx помогите !!!!!

sin7x - sinx = 02*[cos(7x+x)/2]*[sin(7x-x)] /2= 01)  cos(7x+x)/2 = 0cos4x = 04x = π/2 + πn, n∈Zx1 = π/8 + πn/4, n∈Z 2)  sin(7x-x)/2 = 0sin(3x) = 03x = π/2 + πk, k∈Zx2 = π/6 + πk/3, k∈Z