θ∈(0,π),cosθ =-1\3则tanθ=
人气:184 ℃ 时间:2020-08-23 14:02:21
解答
θ∈(0,π),sinθ >0
cosθ =-1\3,sinθ =2√ 2/3
tanθ=sinθ /cosθ=-2√ 2
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