The functions $\tanh x$ and $\arctan x$ have a similar graph. Is there a formula to transform $\tanh x$ to $\arctan x$?
Relationship between $\tanh x$ and $\arctan x$
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trigonometry
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0Is an identity like $\mathrm{tanh}(ix)=i\mathrm{tan}(x)$ what you're looking for? – 2011-12-18