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The expression 1/(x-1)-1/(x+1)-2/(x^2...

The expression `1/(x-1)-1/(x+1)-2/(x^2+1)-4/(x^4+1)` is equal to `8/(x^8+1)` (b) `8/(x^8-1)` (c) `8/(x^7-1)` (d) `8/(x^7+1)`

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