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TrigonometriKelas X
Nilai x antara 0 dan π yang memenuhi cos 2x + cos x ≤ -1 adalah ...
Jawab :
cos 2x + cos x + 1 ≤ 0
2 cos²x - 1 + cos x + 1 ≤ 0
cos x (2 cos x + 1) ≤ 0
- ½ ≤ cos x ≤ 0
π/2 ≤ x ≤ 2π/3
[C]