Consider the cone z² = x² + y² and the sphere x² + y² + z² =

Last updated: 7/8/2022

Consider the cone z² = x² + y² and the sphere x² + y² + z² = 18. They intersect at the point (0, 3, 3), among others. Find the angle (or the cosine of the angle) between these surfaces at the point (0,3,3).