(上海春卷7)已知是双曲线右支上的一点,双曲线的一条渐近线方

(上海春卷7)已知是双曲线右支上的一点,双曲线的一条渐近线方程为. 设分别为双曲线的左、右焦点. 若,则    

答案

解析:由题知a=1,故

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