#1
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cos( arcsin(-\frac{5}{13} )) ¤×Í˹٤Դä´éÊͧ¤ÓµÍº¹èФèÐ à¾ÃÒÐÇèÒÁѹà»ç¹ä»ä´éÍÂÙèÊͧ¨µØÀÒ¤ ú¡Ç¹ªÕá¹Ð˹è͹ФР|
#2
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¹èҨеͺ¤èÒà´ÕÂǤÃѺ cosA = $\frac{12}{13}$à¾ÃÒйÔÂÒÁ¢Í§ arcsin x ãËé¼Åà©ÅÂÍÂÙ躹 $q_1$ ¡Ñº $q_4$
à·èÒ¹Ñé¹ ´Ñ§¹Ñé¹ ¶éÒãËé ÁØÁA = arcsin $\frac{-5}{13}$ ¨Ðä´é sin A = $\frac{-5}{13}$ áÅÐ ¨Ðä´é cosA = $\frac{12}{13}$ |
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