angle help please

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Jeremy Paxman - Yeeeeeeeees

I need to know the angle between a car facing at a certain angle and another car(doesnt matter what direction the second car is facing)

So for example If I have a car at 2x,3y
and another car at 1x,1y

car 1 is facing at a 90 degree angle.

so how far does car 1 have to turn to face car 2

I tried using some vector modules in the code archives but the results always turn out wrong