Nice I see the problem now. I wrote out the first term of my product rule as $2x(y^{2}-x)$ instead of $2x(y^{2}-1)^{-1}$.
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Nice Nice, next to yours I see the problem with mine now. I wrote out the first term of my product rule as $2x(y^{2}-x)$ instead of $2x(y^{2}-1)^{-1}$.
Thanks!