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{x}^{4} + {4 {x}^{2} }
4*x^3 + 8*x
12*x^2 + 8
[x == -sqrt(2)*I, x == sqrt(2)*I, x == 0]
-48
48
\frac{x}{{x}^{2} - 1}
1/(x^2 - 1) - 2*x^2/(x^2 - 1)^2