S = ∫²₁ (х²+1) dx=(x³/3)+x I²₁ = (2³/3)+2 - ((1³/3)+ 1) =8/3 +2 - 1/3 -1 = 1 +7/3 =3 1/3
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S = ∫²₁ (х²+1) dx=(x³/3)+x I²₁ = (2³/3)+2 - ((1³/3)+ 1) =8/3 +2 - 1/3 -1 = 1 +7/3 =3 1/3