y = x 2 y = 2 ( x 2 + 1 ) {\displaystyle {\begin{aligned}&\color {red}\mathbf {y=x^{2}} &\color {royalblue}\mathbf {y={\frac {2}{({x^{2}}+1)}}} \\\end{aligned}}}
∫ 1 − 1 ( 2 ( x 2 + 1 ) ) − ( x 2 ) d x = ∫ 1 − 1 ( 2 1 ( x 2 + 1 ) − ( x 2 ) ) d x {\displaystyle \int _{1}^{-1}\left({\frac {2}{({x^{2}}+1)}})-(x^{2}\right)dx=\int _{1}^{-1}(2{\frac {1}{(x^{2}+1)}}-(x^{2}))dx}
