Mathematics, 15.06.2021 20:20 BreBreDoeCCx

Cho hình chóp SABC có đáy ABC là tam giác đều cạnh a tam giác SAB vuông cân tại s và nằm trong mặt phẳng vuông góc với mặt phẳng đáy cosin của góc giữa đường thẳng SC và mặt phẳng SAB bằng

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Cho hình chóp SABC có đáy ABC là tam giác đều cạnh a tam giác SAB vuông cân tại s và nằm trong mặt p...