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Câu 24:

Biểu thức $\cos \left( {\alpha + 2\pi } \right)$

Câu 24: Biểu thức cos⁡(α+2π)\cos \left( {\alpha + 2\pi } \right)cos(α+2π) bằng:

Thông tin câu hỏi

Câu 24:

Biểu thức $\cos \left( {\alpha + 2\pi } \right)$ bằng: