-1≤sin x≤1, {Ey=[-1;1] - область значений y=sin x, x∈Dy=R},
-1≤sin 2x/3≤1,
-1*4≤4sin 2x/3≤1*4,
-4≤4sin 2x/3≤4,
-3-4≤-3+4sin 2x/3≤-3+4,
-7≤-3+4sin 2x/3≤1,
Ey=[-7;1]
-1≤sin x≤1, {Ey=[-1;1] - область значений y=sin x, x∈Dy=R},
-1≤sin 2x/3≤1,
-1*4≤4sin 2x/3≤1*4,
-4≤4sin 2x/3≤4,
-3-4≤-3+4sin 2x/3≤-3+4,
-7≤-3+4sin 2x/3≤1,
Ey=[-7;1]