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tan(2x) = 2tanx/(1 - tan2x)

So tan(2x) +1 = 2tanx/(1 - tan2x) + 1

= 2tanx/(1 - tan2x) + (1 - tan2x)/(1 - tan2x)

= (-tan2x + 2tanx + 1)/(1 - tan2x)

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Q: What does tangent 2 x plus 1 equal?
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