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à¤Ã×èͧÁ×ͧ͢ËÑÇ¢éÍ | ¤é¹ËÒã¹ËÑÇ¢é͹Õé |
#1
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͹ءÃÁµÃÕ⡳Êèǹ¡ÅѺ
$$ ͹ءÃÁ cosec(2A)+cosec(4A)+...+cosec(2^n A) ÁÕá¹Ç¤Ô´ÍÂèÒ§ääÃѺ$$
14 ¡ØÁÀҾѹ¸ì 2008 18:21 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 1 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ Rossix |
#2
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¹èҨСÓ˹´ condition ¢Í§ A ´éǹФÃѺ
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¤ Ç Ò Á ÃÑ º ¼Ô ´ ª Í º $$|I-U|\rightarrow \infty $$ |
#3
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¨Ò¡ÊٵùÕé¹Ð¤ÃѺ (´Ù ÊÃØ»µÃÕ⡳Ï)$$\tan \frac{\theta}{2} = cosec \theta - cot \theta = \frac{1 - \cos \theta}{\sin \theta} = \frac{\sin \theta}{1 + \cos \theta}$$´Ñ§¹Ñé¹ $$\cot \frac{\theta}{2} = \frac{1 + \cos \theta}{\sin \theta} = cosec \theta + cot \theta$$
¹Ñ蹤×Í $$cosec \theta = cot \frac{\theta}{2} - cot \theta$$ |
#4
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¢Íº¤Ø³ÁÒ¡¤ÃѺ µÍ¹ààá¡ç¹Ö¡ÍÂÙèÇèҨШѴÃÙ»Âѧ䧴Õ
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