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Câu 34:

Cho tứ diện đều ABCD , M là trung điểm của cạnh BC . Khi đó $\cos (A B, D M)$

Câu 34: Cho tứ diện đều ABCD , M là trung điểm của cạnh BC . Khi đó cos⁡(AB,DM)\cos (A B, D M)cos(AB,DM) bằng

Thông tin câu hỏi

Câu 34:

Cho tứ diện đều ABCD , M là trung điểm của cạnh BC . Khi đó $\cos (A B, D M)$ bằng