1. 뼫귽̣
   ԱʹxԶ滻

2. ܷʡԳ˺ţ
   ԣҪرСġxcos2x=x*(cos2)*xxcos(2x)龡ܲҪʡš

3. 붨
   Կʽ2pi5eȣԱ

2. ұô죿
   뽫ıʽ뵯ĴϢύлл֧֡

3. Ϊʲô๦ܲã
   Щǲõܱ߹ܣڴ˰ݺắͼڼܹнϴı䣬ϣںĲֵõϿԺٱдܡ

4. 
   ֱӷʼ5xys@163.com̸̸ĿǰͼٶȡЩҪչԼۣлл

5. дģ飿
   Ȥдģѿɷʼȡ Specs.   