I know that

is differentiable on (0, ) with derivative

but how do I use this to prove that = = -

is also differentiable?

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- Feb 18th 2011, 08:04 AMmaximus101proving that arctanh(x) is differentiable
I know that

is differentiable on (0, ) with derivative

but how do I use this to prove that = = -

is also differentiable? - Feb 18th 2011, 08:12 AMchisigma
- Feb 18th 2011, 08:31 AMmaximus101
- Feb 18th 2011, 10:22 AMchisigma
As You have told is , so that if You instead of write is , and if You write is ...

Kind regards

- Feb 20th 2011, 05:24 AMmaximus101
ok I understand now, thank you :)