已知α,β均为锐角,且α+β=π4,则(1+tanα)(1+tanβ)=_.

问题描述:

已知α,β均为锐角,且α+β=

π
4
,则(1+tanα)(1+tanβ)=______.

∵α,β均为锐角,且α+β=

π
4

∴tan(α+β)=
tanα+tanβ
1−tanαtanβ
=1,
∴tanα+tanβ=1-tanαtanβ,∴tanα+tanβ+tanαtanβ=1
(1+tanα)(1+tanβ)=1+tanα+tanβ+tanαtanβ=1+1=2
故答案为:2