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tanatan2a/(tan2a-tana)+根号3(sin^2a-cos^2)=2sin(2a-派/3) 证明下
sin2a怎么来得请说详细
人气:163 ℃ 时间:2019-11-18 08:54:45
解答
(tanatan2a)/(tan2a-tana)+根号3(sin^2a-cos^2a)=2sin(2a-派/3)tana=tan(2a-a)=(tan2a-tana)/(1+tan2atana) 所以tan2a-tana=tana(1+tan2atana)所以(tanatan2a)/(tan2a-tana)=(tanatan2a)/tana(1+tan2atana)=tan2a/...
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