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Va rog urgent Cos2x>=1/2

Răspuns :

am rezolvat grafic

2x∈(0;60°)U(300°;360°) +2kπ

2x∈(0;π/3)∪(5π/3;2π)+2kπ

x∈(0;π/6)∪(5π/6;π)∪kπ

Vezi imaginea ALBATRAN