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Câu 14:

Nếu $\sin x = 3\cos x$

Câu 14: Nếu sin⁡x=3cos⁡x\sin x = 3\cos xsinx=3cosx thì sin⁡2x\sin 2xsin2x bằng

Thông tin câu hỏi

Câu 14:

Nếu $\sin x = 3\cos x$ thì $\sin 2x$ bằng