Question 62

If x=$$a^{\frac{1}{2}}+a^{\frac{-1}{2}}$$, y=$$a^{\frac{1}{2}}-a^{\frac{-1}{2}}$$ then the value of$$ (x^{4}-x^{2}y^{2}-1)+(y^{4}-x^{2}y^{2}+1)$$

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