5.3 The Fundamental Theorem of Calculus/27

$\int _{2}^{0}x(2+x^{5})dx$
$\int _{2}^{0}(2x+x^{6})dx$
Failed to parse (unknown function "\leftfrac"): {\displaystyle =\leftfrac{2x^2}{1+1}+frac{x^6+1}{6+1}\left\bigg|_{0}^{2}}