[latex]f : mathbb_{R} ightarrow mathbb_{R},quad $ $ f(x) = x^5+x^3+2x\ \ \ intlimits^{1}_{-1} Big({f(x) - x^3-2x} Big), dx = intlimits^{1}_{-1} Big({x^5+x^3+2x - x^3-2x} Big), dx= \ \ =intlimits^{1}_{-1}x^5, dx = dfrac{x^{5+1}}{5+1}Big|_{-1}^1= dfrac{x^6}{6}Big|_{-1}^1 =dfrac{1^6}{6} - dfrac{(-1)^6}{6} = dfrac{1}{6}-dfrac{1}{6} = 0[/latex]