Given to prove
`tanh^(-1) x =1/2 ln((1+x)/(1-x))`
so let
`tanh^(-1) x =y`
=> `x= tanh(y)`
`x =(e^y - e^-y)/(e^y + e^-y)`
=> `(e^y + e^-y)*x = (e^y - e^-y )`
=> `xe^y...
(The entire section contains 123 words.)
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