If tanB=ntanA/1+(1-n)tan2A; then show that tan(A-B)=tanA+2tanB

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If tanB=ntanA/1+(1-n)tan2A; then show that tan(A-B)=tanA+2tanB

If tanB=ntanA/1+(1-n)tan2A; then show that tan(A-B)=tanA+2tanB

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