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tan(a-pi/4)=7 (tana-tanpi/4)/(1+tana*tanpi/4)=7 (tana-1)/(1+tana)=7 tana-1=7+7tana 6tana=-8 tana=-4/3 sina/cosa=-4/3 -4cosa=3sina 又a是第二象限角,則cosa
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