问题
选择题
设tan(α+β)=
|
答案
tan(α+
)=tan[(α+β)-(β-π 4
)]π 4
=tan(α+β)-tan(β-
)π 4 1+tan(α+β)tan(β-
)π 4
=
=
-2 5 1 4 1+
×2 5 1 4 3 22
故选B
设tan(α+β)=
|
tan(α+
)=tan[(α+β)-(β-π 4
)]π 4
=tan(α+β)-tan(β-
)π 4 1+tan(α+β)tan(β-
)π 4
=
=
-2 5 1 4 1+
×2 5 1 4 3 22
故选B