1.

If y= log ((1- x^(2))/(1+ x^(2))), then (dy)/(dx) is equal to

Answer»

`(4x^(3))/(1-x^(4))`
`(-4x)/(1-x^(4))`
`(1)/(4-x^(4))`
`(-4x^(3))/(1-x^(4))`

ANSWER :B


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