[填空题]
Consider the ellipse defined by thda,85kf:v fbazy+ 3dfe equatr.yru ,mxhaf2 8 jn1dd*jn*8qion $x^{2}+3 y^{2}=12$ .
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.
