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Given (x^2+y^2)/(x^2-y^2)+(x^2-y^2)/(x^2...

Given `(x^2+y^2)/(x^2-y^2)+(x^2-y^2)/(x^2+y^2)=k` then ,`(x^8+y^8)/(x^8-y^8)` in terms of k is equal to

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