两角和正切公式：tan(α+β)=(tanα+tanβ)/(1-tanαtanβ)
tan(45°+30°)
=(tan45°+tan30°)/(1-tan45°·tan30°)
=(1+√3/3)/(1-√3/3)
=2+√3
=tan75°
tan(45度+30度）等于多少,
两角和正切公式：tan(α+β)=(tanα+tanβ)/(1-tanαtanβ)
tan(45°+30°)
=(tan45°+tan30°)/(1-tan45°·tan30°)
=(1+√3/3)/(1-√3/3)
=2+√3
=tan75°