There's a difference between academic and practical mathematics
Have to have a good understanding because you may need to detect collisions for something like your character or use vectors to calculate velocity.
Pythagoras theorem to calculate the closest point in game. His example was the mouse to a point on the in game map
Each game differ in the amount of maths needed like a First person shooter like call of duty to be able to shoot or a platformer where you need to be able to calculate the character jumping.
Maths help with calculating light interaction and with something like Spider-Man Miles Morales which has lots of lighting a ray tracing going on at one time.
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