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数学
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已知π/2<α<π,若cosα-sinα=-根号5/5,求(sinα+cosα+2sinαcosα)/(1-tanα)的值
我明天去问一下,不好意思
人气:226 ℃ 时间:2020-03-30 06:17:25
解答
cosα-sinα=-根号5/5
平方后得
1-2sinαsinα=1/5
sinαcosα=2/5
你这题目有问题
π/2<α<π
乘积sinαcosα<0
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