6.1 Areas Between Curves/7

$f(x)=x$

$g(x)=x^{2}$

Failed to parse (syntax error): {\displaystyle Pi\int_{a}^{b}\(R-r)dx}

$R=x$ $r=x^{2}$ Failed to parse (syntax error): {\displaystyle \int_{0}^{1}\(x-x^2)dx} ${\frac {x^{2}}{2}}-{\frac {x^{3}}{3}}{\bigg |}_{0}^{1}$ <math>\frac{1^2}{2}-\frac{1^3}{3}-\frac{0^2}{2}-\frac{0^3}{3} <math\>\frac{1}{6}/math>