如图,在平面直角坐标系xOy中,点A在x轴正半轴上,直线AB的倾斜角为
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,|OB|=2,设
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.
(Ⅰ)用θ表示点B的坐标及|OA|;
(Ⅱ)若
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,求
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的值.
考点分析:
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已知函数
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①
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•
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③
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的下确界为
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