differentiation

Question: If $y = \frac{{\sqrt {{x^2} + 1} + \sqrt {{x^2} - 1} }}{{\sqrt {{x^2} + 1} - \sqrt {{x^2} - 1} }}$, then $\frac{{dy}}{{dx}} = $



1) $2x + \frac{{2{x^3}}}{{\sqrt {{x^4} - 1} }}$
2) $2x + \frac{{{x^3}}}{{\sqrt {{x^4} - 1} }}$
3) $x + \frac{{2{x^3}}}{{\sqrt {{x^4} - 1} }}$
4) None of these
Solution: Explanation: Explanation
standard-differentiation

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