#1
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$cos n\theta =cos^n\theta -\binom{n}{2}cos^{n-2}\theta sin^2\theta +\binom{n}{4}cos^{n-4}\theta sin^4\theta -...$ ã¤Ãà»ç¹¤¹¤Ô´¤é¹ËÃͤÃѺ
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#2
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àÍèÍ... ¶éÒ¶ÒÁÇèÒ ã¤Ãà»ç¹¤¹¤Ô´¤é¹ ¹ÕèµÍºÂÒ¡¤ÃѺ áµèÇÔ¸Õ¾ÔÊÙ¨¹ì¡ç¾ÍÁÕ¤ÃѺ
ÇÒÃì»ä»·Õè¹ÕèàŤÃѺ http://www.mathcenter.net/forum/show...&postcount=491
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#3
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ÍéÒ§ÍÔ§:
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