若tan(A+B)=2/5,tan(A-π/4)=1/4,则tan(B+π/4)等于多少?

问题描述:

若tan(A+B)=2/5,tan(A-π/4)=1/4,则tan(B+π/4)等于多少?

arctan(1/4)+排/4=56.25
arctan(2/5)-B=12.69-B=56.25
B=43.56
tan(43.56+排/4)=39.78