S arctgx dx
Spiegare i passaggi.
S 1* arctg x dx = x arctg x - S 1/(1 + x^2) * x dx =
= x arctg x - 1/2 S 2x/(x^2 + 1) + C =
= x arctg x - 1/2 ln (x^2 + 1) + C
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