1.

Let f(x)= (x^2 - x)/(x^2 + 2x) , then d/(dx) (f^(-1)(x))^(-) is equal to

Answer»

`(1-)/((1-x)^(2))`
`(3)/((1-x)^(2))`
`(1)/((1-x)^(2))`
`(-3)/((1-x)^(2))`

ANSWER :D


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