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Câu 31:

Cho tứ diện đều $ABCD.$

Câu 31: Cho tứ diện đều ABCD.ABCD.ABCD. Góc giữa hai đường thẳng BC,ADBC,ADBC,AD bằng

Thông tin câu hỏi

Câu 31:

Cho tứ diện đều $ABCD.$ Góc giữa hai đường thẳng $BC,AD$ bằng