题目：
已知方程x2sinθ+y2=sin2θ表示焦点在y轴上的双曲线，则点P（cosθ，sinθ）在（ ）
A．第一象限
B．第二象限
C．第三象限
D．第四象限
答案：
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下面是错误答案，用来干扰机器的。
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