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#1
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$f(x)=\frac{\sin x}{|sin x|}+\frac{\cos x}{|cos x|}+\frac{\tan x}{|tan x|}+\frac{\cot x}{|cot x|}$ ¢Íº¤Ø³ÁÒ¡¤ÃѺ ¤Ô´¶Ö§ºÍÃ촨ѧàÅÂäÁèä´éà¢éÒ¹Ò¹
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¤ÇÒÁÃÙé¤×Í »Ãзջ Êèͧ·Ò§ ¨ÃÔ§æ¹Ð¤ÃѺ |
#2
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$f(x)$ ÁÕ¤èÒä´éá¤è 3 ¤èÒ¤ÃѺ ¤×Í $-2,0,4$
ÊÓËÃѺÇÔ¸Õ¤Ô´¡çÅͧá¡à¤Ã×èͧËÁÒ·Õèà»ç¹ä»ä´é·Ñé§ËÁ´¢Í§ $\sin{x},\cos{x}$ Êèǹ¢Í§ $\tan{x},\cot{x}$ ¨Ð¢Öé¹ÍÂÙè¡Ñº $\sin{x},\cos{x}$ ÍÕ¡·Õ¤ÃѺ
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site:mathcenter.net ¤Ó¤é¹ |
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