Spiegare i passaggi.
S (4x^4 - 1)/x^3 dx =
= 4 S x^4/x^3 dx - S x^(-3) dx =
=. 4 S x dx - x^(-2)/(-2) + C =
= 4*1/2 x^2 + 1/(2x^2) + C =
= 2x^2 + 1/(2x^2) + C.
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