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int(5x^8+7x^6)/(x^2+1+2x^7)^2dx is equal...

`int(5x^8+7x^6)/(x^2+1+2x^7)^2dx` is equal to (a) `x/(x^2+1+2x^7)+C` (b) `x^7/(x^2+1+2x^7)+C` (c) `x^6/(x^2+1+2x^7)+C` (d) `x^2/(x^2+1+2x^7)+C`

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