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【简答题】
已知圆C的参数方程为 x= 3 +2cosθ y=2sinθ （θ为参数），若P是圆C与y轴正半轴的交点，以原点为极点，x轴的正半轴为极轴建立极坐标系，求过点P的圆C的切线的极坐标方程．
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9,500 years ago.
B.
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C.
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D.
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