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若(1-tanα)/(1+tanα)=3+2倍的根号下2,则(1+2sinαcosα)/cos^2(α)-sin^2(α)=多少
人气:180 ℃ 时间:2020-06-11 18:45:00
解答
如果是(1+2sinαcosα)/(cos^2(α)-sin^2(α))可用处理齐次式的办法由(1-tanα)/(1+tanα)=3+2倍的根号下2可知tanα=1.5根号下2-2再将(1+2sinαcosα)/(cos^2(α)-sin^2(α))化为(cos^2(α...
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