1.

Differentiate (x^(2)-1)/(x^(2)+1) with respect to x:

Answer»

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

ANSWER :D


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