1.

If y = log {((1 +x)/(1-x )) ^(1//4) } -1/2 Tan ^(-1) (x ), then (dy)/(dx)=

Answer»

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

ANSWER :B


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