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#1
06 µØÅÒ¤Á 2009, 23:22
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ªèǤԴ⨷Âì µÃÕ⡳ 1¢éͷդѺ
ã¹ÊÒÁàËÅÕèÂÁ ABC ÁÕ sin A = 2k , sin B = 3k , sin C = 4k ÊÓËÃѺºÒ§¨Ó¹Ç¹¨ÃÔ§ k áÅéǤèҢͧ
cot A - tan B ¨Ðà·èҡѺ¢éÍã´ µÍºµÔ´ã¹ÃÙ» k ¹Ð¤ÃѺ ¢Íº¤Ø³¤ÃѺ
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Not Me But You 
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#2
07 µØÅÒ¤Á 2009, 00:03
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ÁÑèÇàÍÒ ä´é
$\frac{\sqrt{1-4k^2}}{2k}+\frac{3k}{\sqrt{1-9k^2}}$ ÃÖ»ÅèÒÇ 
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àÁ×èÍäÃàÃÒ¨Ðà¡è§àÅ¢¹éÒÒÒÒÒÒ ~~~~  T T äÁèà¡è§«Ñ¡·Õ ·Óä§´Õ 
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