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ÍØéÂ!! ¢Íâ·É·Õ¤ÃѶ֧ÇèÒ·èÒäÁÁÕ»ÑËÒÂ×´ÂÒǾÔÁ¾ìµ¡ µéͧ¢ÍÍÀѨÃÔ§æ¤ÃѺ
⨷Âìà»ç¹áºº¹Õé¤ÃѺ ÍéÒ§ÍÔ§:
$\sin^5 x=(\dfrac{e^{ix}-e^{-ix}}{2i})^5$ $~~~~~~=\dfrac{e^{5ix}-5e^{4ix}e^{-ix}+10e^{3ix}e^{-2ix}-10e^{2ix}e^{-3ix}+5e^{ix}e^{-4ix}-e^{5ix}}{32i}$ $~~~~~~=(\sin 5x-\sin 3x+10 \sin x)\dfrac{1}{16}$
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no pain no gain 14 ¡Ã¡®Ò¤Á 2011 20:59 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 2 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ No.Name |
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