题目

This is a great truth, one of the greatest truths. It is a great truth because once we truly see this truth, we transcend（超越） it. Once we truly know that life is difficult---once we truly understand and accept it---then life is no longer difficult. Because once it is accepted, the fact that life is difficult no longer matters.Most do not fully see this truth. Instead they complain about their problems and difficulties as if life should be easy. It seems to them that difficulties represent a special kind of suffering especially forced upon them or else upon their families, their class, 设F1、F2为双曲线的两个焦点，点P在双曲线上满足∠F1PF2=90°，那么△F1PF2的面积是          .