For most maths, at least the stuff you'd learn before or during an undergrad degree the interesting maths is the journey. The teacher is attempting to teach you

For most maths, at least the stuff you'd learn before or during an undergrad degree the interesting maths is the journey. The teacher is attempting to teach you to ride a bike, and the student is like "this is stupid, I already walked to the end of the road". The teaching of different ways of making the journey is (often) the destination.