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一张纸片由三角形PAD和矩形ABCD组成,且PA=PD=AB=2,现将纸片沿AD...
一张纸片由三角形PAD和矩形ABCD组成,且PA=PD=AB=2,现将纸片沿AD折成一个直二面角,则四棱锥P-ABCD外接球的体积是 .
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已知
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的展开式中的常数项为-160,则展开式中各项的系数之和为
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已知球O的半径为
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,点A为球面上的点,过A作球O的截面圆O
1,设圆O
1的周长为x,球心O到截面圆O
1的距离为y,当xy的值最大时,圆O
1的面积是
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已知a∈(0,π),且sina+cosa=
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,则cos2a的值为
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把函数
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(ω>0)的图象向右平移
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A.2
B.4
C.6
D.8
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已知F为双曲线
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的右焦点,P为双曲线C右支上一点,且位于x轴上方,M为直线
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上一点,O为坐标原点,已知
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,且
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A.2
B.
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C.
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D.4
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