已知正切函数y=tanx的图象关于点M(θ,0)对称
θ=kπ
cosθ=±1请问为什么cosθ=±1？θ=0,cosθ=1θ=π,cosθ=-1
已知正切函数y=tanx的图象关于点M(θ,0)对称,则cosθ=
已知正切函数y=tanx的图象关于点M(θ,0)对称,则cosθ=
数学人气：931 ℃时间：2019-12-01 13:07:18
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