8. (a) Rewrite the integral as an equivalent integral in the $dzdydx$ order.\\
$\int_0^1 \int_0^{1-\sqrt{1-(y-1)^2}} \int_{-\sqrt{1-z}}^{\sqrt{1-z}} f(x, y, z) dxdzdy$\\
(b) Convert the integral to an equivalent integral in spherical coordinates.\\
$\int_0^\pi \int_0^{2\sin\theta} \int_{\sqrt{2r\sin\theta-r^2}}^{\sqrt{4-r^2}} f(r\cos\theta, r\sin\theta, z)r dzdr d\theta$
