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## Homework Statement

What is the angle theta between vectors vec A and vec B if vec A = 4 -3 and

vec B = -2 + 5?

## Homework Equations

arccos((a dot b)/(|a||b|))

## The Attempt at a Solution

4*-2+-3*5=-23

sqrt(4^2+-3^2)*sqrt(-2^2+5^2)=10.39

arc

not sure what i am doing wrong but that's the equation i found online and i keep getting undefined when i plug it into my calculator

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