Cos (П: 3 — 2x) — cos

Cos (П/3 — 2*x) — cos (П/6+2*х) ≤ 12*sin (π/3 — 2*x+π/6+2*x) /2)*sin (π/6+2*x — π/3+2*x) /2) ≤ 12*sin π/4*sin (2*x — π/12) ≤ 1sin (2*x — π/12) ≤ 1 / √ 2-5*π/4+2*π*n ≤ 2*x — π/12 ≤ π/4+2*π*n-7*π/6+2*π*n ≤ 2*x ≤ π/3+2*π*n-7*π/12+π*n ≤ x ≤ π/6+π*n