求证:tan α=(sin α)/(sin α)求证:tan α=(sin α)/(cos α)
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求证:tan α=(sin α)/(sin α)求证:tan α=(sin α)/(cos α)
求证:tan α=(sin α)/(sin α)
求证:tan α=(sin α)/(cos α)
求证:tan α=(sin α)/(sin α)求证:tan α=(sin α)/(cos α)
依据定义
sina=y/z
cosa=x/z
tana=y/x=(y/z)/(x/z)=sina/cosa
求证:(tanα+tanβ)/(tanα-tanβ)=sin(α+β)/sin(α-β)
求证:tan α=(sin α)/(sin α)求证:tan α=(sin α)/(cos α)
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