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(-3 t^4 - 2 t^2 x^2 + 2 t^2 x - t^2 + x^4 - 2 x^3 + x^2)'
(-3 t^4 - 2 t^2 x^2 + 2 t^2 x - t^2 + x^4 - 2 x^3 + x^2)'
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