tan(α+β)=tanπ/4=1
tan(α+β)=(tanα+tanβ)/(1-tanαtanβ)=1
tanα+tanβ=1-tanαtanβ
tanα+tanβ+tanαtanβ=1
(1+tanα)(1+tanβ)
=tanαtanβ+tanα+tanβ+1
=1+1
=2
祝学习快乐!
tan(α+β)=tanπ/4=1
tan(α+β)=(tanα+tanβ)/(1-tanαtanβ)=1
tanα+tanβ=1-tanαtanβ
tanα+tanβ+tanαtanβ=1
(1+tanα)(1+tanβ)
=tanαtanβ+tanα+tanβ+1
=1+1
=2
祝学习快乐!