已知向量
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滿足
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,且
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.
(1)、求向量
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的坐標; (2)、求向量
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與
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的夾角.
(1)
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;(2)
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(1)
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,又∵ 已知
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,且
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∴
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解得
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∴
(2)設(shè)向量
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與
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的夾角
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∵
∴
∵
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∴向量
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與
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的夾角
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