Объяснение:
cos²x≥0,5
(1+cos2x)/2≥0,5
1+cos2x≥1
cos2x≥1-1
cos2x≥0
-π/2+πn≤2x≤π/2+πn,n∈z
-π/4+πn/2≤x≤π/4+πn/2,n∈z
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Объяснение:
cos²x≥0,5
(1+cos2x)/2≥0,5
1+cos2x≥1
cos2x≥1-1
cos2x≥0
-π/2+πn≤2x≤π/2+πn,n∈z
-π/4+πn/2≤x≤π/4+πn/2,n∈z