| [ QuizWit ] in KIDS 글 쓴 이(By): iLUSiON (띠띠빤쮸) 날 짜 (Date): 2006년 1월 13일 금요일 오전 07시 34분 58초 제 목(Title): Re: 정수+기하 haha i remember! this problem is solved in 2 stages. first prove that sin (A1) + ..... sin(An) \leq sin(2pi/n)*n this is easy since sin is convave function. apply inequlity involing convex function... second stage... arrrr...i can't remember arrrrr iLUSiON - le plus grand de tous http://cyworld.nate.com/ilusion |