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-*-' 06 µØÅÒ¤Á 2009 23:22
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







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-InnoXenT- 07 µØÅÒ¤Á 2009 00:03
ÁÑèÇàÍÒ ä´é

$\frac{\sqrt{1-4k^2}}{2k}+\frac{3k}{\sqrt{1-9k^2}}$

ÃÖ»ÅèÒÇ :p


àÇÅÒ·ÕèáÊ´§·Ñé§ËÁ´ à»ç¹àÇÅÒ·Õè»ÃÐà·Èä·Â (GMT +7) ¢³Ð¹Õéà»ç¹àÇÅÒ 21:44

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