Al-Khwarizmi, the father of algebra

Algebra Level 3

If 1+x+1x1+x1x=R\dfrac{\sqrt{1+x}+\sqrt{1-x}}{\sqrt{1+x}-\sqrt{1-x}}=R, then what is the value of 2R24Rx2R^{2}-\dfrac{4R}{x}?

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