填空题,(1)已知sinacosa=-1/3,a属于(拍/2,拍),则sina—cosa=(2)已知一个长方体的长,宽,高分别为2,2,4,其外接球为球O.那么,球O的外切正方体全面积是
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![填空题,(1)已知sinacosa=-1/3,a属于(拍/2,拍),则sina—cosa=(2)已知一个长方体的长,宽,高分别为2,2,4,其外接球为球O.那么,球O的外切正方体全面积是](/uploads/image/z/12510472-40-2.jpg?t=%E5%A1%AB%E7%A9%BA%E9%A2%98%2C%EF%BC%881%EF%BC%89%E5%B7%B2%E7%9F%A5sinacosa%3D-1%2F3%2Ca%E5%B1%9E%E4%BA%8E%28%E6%8B%8D%2F2%2C%E6%8B%8D%EF%BC%89%2C%E5%88%99sina%E2%80%94cosa%3D%EF%BC%882%EF%BC%89%E5%B7%B2%E7%9F%A5%E4%B8%80%E4%B8%AA%E9%95%BF%E6%96%B9%E4%BD%93%E7%9A%84%E9%95%BF%2C%E5%AE%BD%2C%E9%AB%98%E5%88%86%E5%88%AB%E4%B8%BA2%2C2%2C4%2C%E5%85%B6%E5%A4%96%E6%8E%A5%E7%90%83%E4%B8%BA%E7%90%83O.%E9%82%A3%E4%B9%88%2C%E7%90%83O%E7%9A%84%E5%A4%96%E5%88%87%E6%AD%A3%E6%96%B9%E4%BD%93%E5%85%A8%E9%9D%A2%E7%A7%AF%E6%98%AF)
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