Решите неравенство a) (-3; 0) u [2; 4] b) [-3; - вопрос №9221177302430243 от mrtocilin 02.04.2021 06:35

Question

Математика: Решите неравенство a) (-3; 0) u [2; 4] b) [-3; 0] u (2; 4) c) (-∞; -3) u (0; 2) u (4; ∞) d) (-3; 0] u [2; 4)

mrtocilin · Answer

4cos²x-3≥0cos²x≥3/4|cosx|≥√3/2[cosx≥√3/2[cosx≤-√3/21)cosx≥√3/2-π/6+2πk≤x≤π/6+2πk2)cosx≤-√3/25π/6+2πk≤x≤4π/3+2πk...