题目

回答问题；阅读下面的短文，然后根据短文内容回答问题。       Liu Wei is very famous in China because he can play the piano with his toes(脚趾).       One day when Liu Wei was only 10 years old, he played a game with some friends. He lost both his arms because of electricity.       Liu Wei was very sad when both his arms were cut off after the accident. But soon he had to make a choice.       “For people like me, there were only two choices. One was to give up all the dreams, which would cause a quick death. The other was to work hard withou若a 、b 为锐角，且a ＋b =45°，化简(1＋tana )(1＋tanb )．