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Câu 12:

Cho phương trình $\cos 4x = 3m - 5$

Câu 12: Cho phương trình cos⁡4x=3m−5\cos 4x = 3m - 5cos4x=3m−5. Tìm mmm để phương trình đã cho có nghiệm.

Thông tin câu hỏi

Câu 12:

Cho phương trình $\cos 4x = 3m - 5$ . Tìm $m$ để phương trình đã cho có nghiệm.