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# Prove the identity.$\tanh (\ln x) = \frac {x^2 - 1}{x^2 + 1}$

## $\frac{x^{2}-1}{x^{2}+1}$

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### Video Transcript

we know that tangent is signed over coastline. The sick of want to you did the natural look of accidents is the negative natural artifacts over eat the natural of acts plus e the negative natural of packs It's equivalent to X squared over X squared X squared minus one over X squared plus one. Therefore, we know that sign. Age of axe is e of axe. I want to see if negative axe over too co sign a check box X plus You have night of X over too. And then tangent we know is sign divided by Cho Sun

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