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#1
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˹ѧÊ×ÍÊÍǹ àÃ×èͧ¨Ó¹Ç¹àªÔ§«é͹
¶éÒ n à»ç¹¨Ó¹Ç¹àµçÁºÇ¡ ¨§áÊ´§ÇèÒ sin$\frac{\pi }{n}$ $\bullet $ sin2$\frac{\pi }{n}$ $\bullet $ sin3$\frac{\pi }{n}$ $\bullet $ $\bullet $ $\bullet $ sin(n-1)$\frac{\pi }{n}$ = n $\bullet $ $2^ {1-n}$
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#2
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#3
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ÍéÒ§ÍÔ§:
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