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#1
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⨷ÂìµÃÕ⡳ ¢Íá¹Ç¤Ô´Í¸ÔºÒÂẺÅÐàÍÕ´ãËé˹è͹ФÐ
cos¡ÓÅѧ2 15 cos¡ÓÅѧ2 75=?
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#2
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cos(15)^2=(1+cos(30))/2
cos(75)^2=(1+cos(150))/2
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