Cho hình lập phương \(ABCD.A'B'C'D'\) có tâm \(O.\...
Câu hỏi: Cho hình lập phương \(ABCD.A'B'C'D'\) có tâm \(O.\) Gọi \(I\) là tâm của hình vuông \(A'B'C'D'\) và M là điểm thuộc đoạn thẳng\(OI\) sao cho \(MO = 2MI\) (tham khảo hình vẽ). Khi đó cosin của góc tạo bởi hai mặt phẳng \(\left( {MC'D'} \right)\) và\(\left( {MAB} \right)\) bằng![](data:image/jpeg;base64,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)
A \(\dfrac{{6\sqrt {85} }}{{85}}\)
B \(\dfrac{{7\sqrt {85} }}{{85}}\)
C \(\dfrac{{17\sqrt {13} }}{{65}}\)
D \(\dfrac{{6\sqrt {13} }}{{65}}\)
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi thử THPT QG môn Toán năm 2019 - Thầy Chí - Đề số 4