Mathematics, 19.08.2021 08:40 kingdevin16

Cho hình. Chóp tứ giác đều S. abcd đáy abcd là hình vuông cạnh sa=sb=sc=sd=a. Tính cosin của góc giữa (sab) và(sad)

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Cho hình. Chóp tứ giác đều S. abcd đáy abcd là hình vuông cạnh sa=sb=sc=sd=a. Tính cosin của góc g...

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