It's too hard for limits?

Calculus Level 4

\[\large\displaystyle\lim_{x\to 0}\left(\dfrac{\sqrt{1+x}-\sqrt{1-x}-\sqrt{\left(1+x\right)\left(1-x^2\right)}+\sqrt{\left(1-x\right)\left(1-x^2\right)}}{x^3}\right)=\ ?\]

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