The area bounded by the curve $y=\sin \left(\frac{x}{3}\right)$, $x$ axis, the lines $x=0$ and $x=3 \pi$ is

The area of the region bounded by the line $y=3 x$ and the curve $y=x^2$ sq units is

The area of the region bounded by the line $y=x$ and the curve $y=x^3$ is