已知cos α=1/2,求sin α,tan α,cot α的值
人气：304 ℃ 时间：2019-10-11 01:32:07
解答
sinα=±√1-(cosα)^2=±√1-(1/2)^2=±√3/4=±√3/2
tanα=sinα/cosα=±(√3/2)/(1/2)=±√3
cotα=cosα/sinα=±(1/2)/(√3/2)=±√3/3
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