Spiegare i passaggi.
S dt/(t^2 + 6t + 10) =
= S dt/(t^2 + 6t + 9 + 1) =
= S 1/[(t + 3)^2 + 1] dt =
= S d(t+3)/[1 + (t+3)^2 ] =
= arctg* (t + 3) + C
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