§ 17: 17.15

17.15 Знайдіть область значень виразу:

1) y = 12+sinx; –1 ≤ sinx ≤ 1; 1 ≤ 2 + sinx ≤ 3;

13 ≤ 12+sinx ≤ 1; y ∈ [13; 1];

2) y = 11-cosx; –1 ≤ cosx ≤ 1; –1 ≤ –cosx ≤1; 0 ≤ 1 – cosx ≤ 2;

12 ≤ 11-cosx ≤ +∞, y ∈ [12; +∞).