Question

интеграл 1 по -1 (х^2+1)dxdx

Answer 1

$frac{x^3}{3} +x/^{1}_{-1}= frac{(1)^3}{3} +1-(- frac{1}{3} -1)= frac{2}{3} +2= frac{8}{3}$

Answer 2

$intlimits^{1}_{-1} {(x^2+1)} , dx= ( frac{x^3}{3}+x)|^{1}_{-1}=( frac{1}{3}+1)-(- frac{1}{3}-1)=\\= frac{1}{3} +1+ frac{1}{3} +1=2 frac{2}{3}$