If x^(6)+1/(x^(6))=k(x^(2)+1/(x^(2))) th...

If `x^(6)+1/(x^(6))=k(x^(2)+1/(x^(2)))` then k is equal to

A

`(x^(2)-1+1/(x^(2)))`

B

`(x^(4)-1+1/(x^(4)))`

C

`(x^(4)+1+1/(x^(4)))`

D

`(x^(4)-1-1/(x^(4)))`

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