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若tanα=(√15),则cosα=?sinα=?
人气:217 ℃ 时间:2020-05-20 16:39:29
解答
(secα)^2 = 1 + (tanα)^2 = 1 + 15 =16
secα=±4
cosα=1/secα=±1/4
sinα=±√[1-(cosα)^2]=±√15/4
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