1. The problem statement, all variables and given/known data I have a problem that says: Find the directional derivative of C(x, y) in the radial direction at any surface point (x, y). It then says: Find the shark’s approach path from any point (x0, y0) at the sea surface. I found the directional derivative in the radial direction, but how do I find the approach path? (Basically, what is meant by "approach path") 2. Relevant equations 3. The attempt at a solution See question above.