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Old 07 àÁÉÒ¹ 2014, 18:06
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2tan(-) =1 ¨§ËÒ¤èҢͧ 10sin(-) +7cos(-) ËÒôéÇ 4sin(-) +3cos(-)

(-) = theta

07 àÁÉÒ¹ 2014 18:07 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 1 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ shiro40
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