∫(x·LN(x^4))dx=
ti devi ricordare che: LN(x^4) = 2·LN(x^2)
=∫(x·(2·LN(x^2))dx=
=2·∫(x·LN(x^2))dx=
=2·(x^2·LN(x^2)/2 - x^2/2)=
=x^2·LN(x^2) - x^2 + c
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