[填空题]
Consider the ellipse defined by th wsa )jwrlgz, dza*u e;m*k/3+xd+i (y96snav hv- m4cqmn 9i)q ip.6ke equation $x^{2}+3 y^{2}=12$ .
1. Find the equation of the normal to the ellipse at the point P(3,1) . y =
2. Find the volume of the solid formed when the region bounded by the ellipse, the x -axis for $x \geq 0$ and the y -axis for $y \geq 0$ is rotated through $2 \pi$ about the y -axis.
