How to "does this point belongs to this sector" ?

[OhSoGood]

Hi,

A beginner with geodesy computations, I've to check if a point, known by its latitude and longitude, belongs to a sector, defined by the latitude and longitude of its origin and its start and end azimuths. I'm lost on how to do this. Could anybody help me? Code or pseudo-code would be very welcome... Thank you!

[chrisveness]

Could you clarify what you mean by a 'sector'?

[OhSoGood]

Like the pie within a circle, but with no radius limit.
Actually, with just polar coordinates that's obvious (compute bearing to point, then compare angles). But with vector I'm wondering how to achieve that.