已知\(\tan α= \dfrac {m}{3},\tan (α+ \dfrac {π}{4})= \dfrac {2}{m}.\)则\(m=(\)　　\()\) --优优班--学霸训练营

已知\(\tan α= \dfrac {m}{3},\tan (α+ \dfrac {π}{4})= \dfrac {2}{m}.\)则\(m=(\)　　\()\)

A．\(-6\)或\(1\)

B．\(-1\)或\(6\)

C．\(6\)

D．\(1\)

【考点】三角函数的化简求值

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【解答】请登陆后查看

难度：易

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