在平面直角坐标系xOy中,点A(0,2),B(-1,-1),C(2,3).
(Ⅰ)求∠BAC的大小;
(Ⅱ)求以线段AB,AC为邻边的平行四边形两条对角线的长.
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.
(Ⅰ)求函数f(x)的定义域;
(Ⅱ)已知
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的值.
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函数
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,x∈R的部分图象如右图所示.设P是图象上的最高点,M,N是图象与x轴的交点,则tan∠MPN=
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设角θ的终边经过点(-3,4),则
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=
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若向量
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满足|
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与
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•(
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+
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)=
.
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