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For any two non-zero rational numbers x and y, `x^4 -: y^4` is equal

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For any two non-zero rational numbers x and y, `x^4 -: y^4` is equal to
Options:

(a) `(x -: y)^0`

(b) `(x -: y)^1`

(c) `(x -: y)^4`

(d) `(x -: y)^8`

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