If `tanA=m/(m-1)` and `tan(B)=n`, find the values of `tan 2A` and `tan

1.	If `tanA=m/(m-1)` and `tan(B)=n`, find the values of `tan 2A` and `tan 2B`.
Answer» `tan2A=(m+n)/(1-mn)`, `tan2B=(m-n)/(1+mn)`

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