Is the point $( -2, -3, 3 )$ visible from the point $( 2, 3, 0 )$ if there is an opaque ball of radius $1$ centered at the origin?
? yes no

Suppose that you stand at the point $( 2, 3, 0 )$ and look in the direction of a point that is not visible because it is behind the ball. You will then be looking at a point on the sphere.

If $( -2, -3, 3 )$ is not visible from $( 2, 3, 0 )$, find the point on the sphere at which you are looking if you look in the direction of $( -2, -3, 3 )$. Otherwise, find the point on the sphere at which you look if you are looking in the direction of $(-2, -3, 2)$.
Point $(x, y, z) =$