Evaluate
\frac{-2x^{3}+2x^{2}+\sqrt{5}}{x^{2}-x-1}
Differentiate w.r.t. x
\frac{-2x^{4}+4x^{3}+4x^{2}-2\sqrt{5}x-4x+\sqrt{5}}{x^{4}-2x^{3}-x^{2}+2x+1}
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\frac{-2x^{3}+2x^{2}+\sqrt{5}}{x^{2}-x-1}
Combine x and -x to get 0.
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