sinα+cosα=7/5 sin2α=?
人气:349 ℃ 时间:2020-03-31 19:08:17
解答
sinα+cosα=7/5
所以(sinα+cosα)^2=(7/5)^2=49/25
所以1+2sinαcosα=49/25
所以sin2α=2sinαcosα=24/25
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