[分析] 微幾兩題

[ADAH33 (逐漸消失的生命)]

 (1) show that ellpse r(t)=(acost , bsint) is convex

 (2) show that the Limacon r(t)=[(1+2cost)cost , (1+2cost)sint]

     ( t為實數 ) has only two vertices


     拜託大家了^^

--
※ 發信站: 批踢踢實業坊(ptt.cc) 
◆ From: 140.127.71.82
推 ntust661:ellipse??
→ ADAH33:第一提已經想出來了，謝謝大家^^