Q 1135456362.     If `y=tan^(-1) ((sqrt(1+x^2)+sqrt(1-x^2))/((sqrt(1+x^2))-sqrt(1-x^2)))`, `x^2≤1`, then find `dy/dx`.

A

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

B

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

C

`2x/sqrt(1-x^4)`

D

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

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