tana=1/2,tan(a+b)=2,tanb=
RT
人气：226 ℃ 时间：2020-04-08 10:55:51
解答
tan(a+b)=(tana+tanb)/(1-tanatanb)=2
所以(1/2+tanb)/(1-1/2*tanb)=2
1/2+tanb=2-tanb
tanb=3/4
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