y'=(x^3-2)'(x^2+1)+(x^3-2)(x^2+1)'=3x^2(x^2+1)+(x^3-2)2x=
=3x^4+3x^2+2x^4-4x=5x^4+3x^2-4x
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y'=(x^3-2)'(x^2+1)+(x^3-2)(x^2+1)'=3x^2(x^2+1)+(x^3-2)2x=
=3x^4+3x^2+2x^4-4x=5x^4+3x^2-4x