`y= tan^(-1)(sqrt(1+x^2)+sqrt(1-x^2))/(sqrt(1+x^2)-sqrt(1-x^2))` then `dy/dx`

`y= tan^(-1)(sqrt(1+x^2)+sqrt(1-x^2))/(sqrt(1+x^2)-sqrt(1-x^2))` then `dy/dx`
A. `(1)/(sqrt(1-x^(4)))`
B. `-(1)/(sqrt(1-x^(4)))`
C. `(x)/(sqrt(1-x^(4)))`
D. `-(x)/(sqrt(1-x^(4)))`

`y= tan^(-1)(sqrt(1+x^2)+sqrt(1-x^2))/(sqrt(1+x^2)-sqrt(1-x^2))` then `dy/dx`

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