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已知向量m=(
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,
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),n=(
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,
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),记f(x)=m•n;
(1)若f(x)=1,求
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的值;
(2)若△ABC中,角A,B,C的对边分别是a,b,c,且满足(2a-c)cosB=bcosC,求函
数f(A)的取值范围.
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已知△ABC中,(a-c)(sinA+sinC)=(a-b)sinB,(1)求∠C;(2)若△ABC的外接圆半径为2,试求该三角形面积的最大值.
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已知A、B、C是直线l上的不同三点,O是l外一点,向量
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满足
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,记y=f(x);
(1)求函数y=f(x)的解析式;
(2)求函数y=f(x)的单调区间.
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已知等腰直角三角形AOB中,AC、BD为中线,求
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与
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夹角θ的余弦值.
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