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2021-05-20 |
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2021-05-20 |
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f ' (x) <= 0 À̶ó´Â ½ÄÀ» ¾²½Ã¸é¼ µîÈ£°¡ ¼º¸³ÇÏ´Â °ÍÀº °¨¼ÒÇÏ´Â ±¸°£À̱⠶§¹®¿¡ °¡´ÉÇÑ°ÍÀ̶ó Çϼ̴µ¥, ¾î¶² ¸»¾¸À̽ŰÇÁö Àß ÀÌÇØ°¡ µÇÁú ¾Ê½À´Ï´Ù. ¾ÆÁ÷µµ °°¨¼Ò¿Í ´ÜÁ¶°¨¼Ò°¡ Àß ±¸ºÐµÇÁö ¾Ê´Â°Í °°¾Æ¿ä~ ¾î¶»°Ô ÀÌÇØÇϸé Çò°¥¸®Áö ¾ÊÀ»±î¿ä? °¨¼ÒÇÏ´Â ±¸°£À롂 °°¨¼Òµµ ´ÜÁ¶°¨¼Òµµ ¸ðµÎ Åë¿ëµÇ´Â ¸»ÀÎ°Í °°Àºµ¥, °¨¼ÒÇÏ´Â ±¸°£ÀÌ´Ù¶ó´Â ¹®ÀåÀ¸·Î °°¨¼ÒÀÎÁö ´ÜÁ¶°¨¼ÒÀÎÁö ¾î¶»°Ô ±¸ºÐÇÒ±î¿ä? ¾ÆÁ÷ Á¦°¡ °³³äÀ» À߸𸣴°ɱî¿ä?
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x->¹«ÇÑ´ë lim x(sin1/x)=1ÀÎ ÀÌÀ¯°¡ sinÀ» ¹«½ÃÇؼ ±×·±°ÅÀݾƿä. ±×·±µ¥ x->¹«ÇÑ´ë´Ï±î ¹«ÇÑ´ëX(sin1/¹«ÇÑ´ë), Áï 0Xsin0ÀÌ´Ï±î ´äÀº 0 ¾Æ´Ñ°¡¿ä? ÀÌÇØ°¡ Á¤¸» ¾ÈµÇ´Âµ¥ ¹«½ÃÇϱ⠸»°í Á¤¼®ÀûÀÎ Ç®À̹æ¹ýÀ¸µµ ¾Ë·ÁÁÖ¼¼¿ä.
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