tan(a+π/4)=3,tana=?

tan(a+π/4)=3,tana=?
tan(a+π/4)=3,tana=?

tan(a+π/4)=3,tana=?
tan(a+π/4)=3即(tana+tanπ/4)/1-tana tanπ/4
=tana+1/1-tana
=3
所以tana=1/2

tan(a+π/4)=3
tana+1/1-tana=3
tana=1/2