已知tan(a+π/4)=3/5,则tana

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已知tan(a+π/4)=3/5,则tana
已知tan(a+π/4)=3/5,则tana

已知tan(a+π/4)=3/5,则tana
tan(a+π/4)= 3/5
{ tana + tan(π/4) } / { 1 - tana*tan(π/4) } = 3/5
( tana + 1) / ( 1 - tana*1 ) = 3/5
3( 1 - tana ) = 5( tana + 1)
3 - 3tana = 5 tana + 5
8 tana = -2
tana = -1/4