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Câu 5:

Cho phương trình $cos3x – 4 cos2x + 3cos x – 4 = 0$

Câu 5: Cho phương trình cos3x–4cos2x+3cosx–4=0cos3x – 4 cos2x + 3cos x – 4 = 0cos3x–4cos2x+3cosx–4=0 có bao nhiêu nghiệm trên [0; 14]?

Thông tin câu hỏi

Câu 5:

Cho phương trình $cos3x – 4 cos2x + 3cos x – 4 = 0$ có bao nhiêu nghiệm trên [0; 14]?