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数学
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求大神解:已知cosa=2m/(m^2+1).(m≤-1), .求sina,tana
求解答
人气:223 ℃ 时间:2020-04-04 19:26:19
解答
cosa=2m/(m^2+1),sina=±√[1-(cosa^2)]=±(m^2-1)/(m^2+1),tana=sina/cosa=±(m^2-1)/(2m)
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