已知P是以F1、F2为焦点的双曲线=1(a>0,b>0)上的一点,若=0,tan∠PF1

已知P是以F1、F2为焦点的双曲线=1(a>0,b>0)上的一点,若=0,tan∠PF1F2=2,则此双曲线的离心率为(    )

A.3              B.5              C.             D.

答案

C

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