1.

Expansion of log(sqrt((1+x)/(1-x))) is :

Answer»

`X + x^(3)/3 + x^(5)/5 + ... `
`1+x^(2)/2 +x^(4)/4 + ...`
`1-x + x^(2)/2 -x^(3)/5 + ...`
`x- x^(2)/3 + x^(3)/3 - ...`

Answer :a


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